Google is a megacorp, and while megacorps aren't fundamentally "evil" (for some definitions of evil), they are fundamentally unconcerned with goodness or morality, and any appearance that they are is purely a marketing exercise.
I think megacorps being evil is universal. It tends to be corrupt cop evil vs serial killer evil, but being willing to do anything for money has historically been categorized as evil behavior.
That doesn’t mean society would be better or worse off without them, but it would be interesting to see a world where companies pay vastly higher taxes as they grow.
So in effect you have to call the employees and shareholders evil. Well those are the same people who also work and hold public office from time to time, or are shareholders, or whatever. You can't limit this "evilness" to just an abstract corporation. Not only is it not true, you are setting up your "problem" so that it can't be addressed because you're only moralizing over the abstract corporation and not the physical manifestation of the corporation either. What do you do about the abstract corporation being evil if not taking action in the physical world against the physical people who work at and run the corporation and those who buy its products?
I've noticed similar behavior with respect to climate change advocacy and really just "government" in general. If you can't take personal responsibility, or even try to change your own habits, volunteer, work toward public office, organize, etc. it's less than useless to rail about these entities that many claim are immoral or need reform if you are not personally going to get up and do something about it. Instead you (not you specifically) just complain on the Internet or to friends and family, those complaints do nothing, and you feel good about your complaining so you don't feel like you need to actually do anything to make change. This is very unproductive because you have made yourself feel good about the problem but haven't actually done anything.
With all that being said, I'm not sure how paying vastly higher taxes would make Google (or any other company) less evil or more evil. What if Google pays more taxes and that tax money does (insert really bad thing you don't like)? Paying taxes isn't like a moral good or moral bad thing.
I don't think it's necessary to conclude that because a company is evil then everyone who works at the company is evil. But it's sort of like the evilness of the company is a weighted function of the evilness of the people who control it. Someone with a small role may be relatively good while the company overall can still be evil. Someone who merely uses the company's products is even more removed from the company's own level of evil. If the company is evil it usually means there is some relatively small group of people in control of it making evil decisions.
Now, I'm using phraseology here like "is evil" as a shorthand for "takes actions that are evil". The overall level of evilness or goodness of a person is an aggregate of their actions. So a person who works for an evil company or buys an evil company's products "is evil", but only insofar as they do so. I don't think this is even particularly controversial, except insofar as people may prefer alternative terms like "immoral" or "unethical" rather than "evil". It's clear people disagree about which acts or companies are evil, but I think relatively few people view all association with all companies totally neutrally.
I do agree with you that taking personal responsibility is a good step. And, I mean, I think people do that too. All kinds of people avoid buying from certain companies, or buy SRI funds or whatever, for various ethically-based reasons.
However, I don't entirely agree with the view that says it's useless or hypocritical to claim that reform is necessary unless you are going to "do something". Yes, on some level we need to "do something", but saying that something needs to be done is itself doing something. I think the idea that change has to be preceded or built from "saintly" grassroots actions is a pernicious myth that demotivates people from seeking large-scale change. My slogan for this is "Big problems require big solutions".
This means that it's unhelpful to say that, e.g., everyone who wants regulation of activities that Company X does has to first purge themselves of all association with Company X. In many cases a system arises which makes such purges difficult or impossible. As an extreme, if someone lives in an area with few places to get food, they may be forced to patronize a grocery store even if they know that company is evil. Part of "big solutions" means replacing the bad ways of doing things with new things, rather than saying that we first have to get rid of the bad things to get some kind of clean slate before we can build new good things.