"Take the power back" by not continuing to give them your money.
But I know too many people who are very vocal about how Apple is bad and how they should be stopped, and yet these people keep buying a new iThing every year.
It shows three situations, two of which depict normal progress ("there is this useful thing that has flaws because nobody has cared enough to fix those flaws, let's try"; Mr. Gotcha's burn is out of line), and one depicts standard corporate behavior ("a brand is willfully behaving in several ways that the society knows is abusive, and fans of that brand are willfully blind towards that)"; Mr. Gotcha's burn is very much deserved).
In short, one of these things is not like the others.
Even if you go the route of sacrificing your social life for these principles nothing will change - you are just a single lost sale amongst billions. Having people talk about the problems might actually spark change. What does pointing out this alleged "hypocrisy" achieve, besides making yourself feel smarter/superior?
The linked comic talks about underpaid factory workers in China - every company that sells smartphones suffers from this to some extend because tracking down supply chains many links in becomes very difficult. It is not so easy to determine with 100% certainty where the guy that sold you the refined metal for the CPU chip got his unrefined metal from. Apple has actually made big efforts in attempting to eradicate slave/child labor [1] - so if you care about human rights of labourers in third world countries you should probably buy an iPhone.
None of this is black and white, both Google and Apple have tons of problems. If you say "don't buy Apple if you don't support walled gardens", then someone else will say "don't buy Google if you don't support extensive privacy invasion". There is no correct choice - you can only fight the specific problems.
[1] https://www.voanews.com/archive/apple-wins-global-award-effo...