Side gigs aren't worth it. If you're at a decent company, my boss feeling slightly more enthusiastic at my potential could mean tens of thousands of dollars more in bonus/stock at the end of the year. I'd rather work harder on work.
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I don't know what you mean by 'moderately rich', but I know multiple people who have saved millions of dollars (including myself), some of which who were able to retire early by working for 'someone else' - also none of which are union shops.
Do you really not know that many people have gotten quite rich working for FAANG companies? Do you also not know these people are much richer than union workers?
If you happen to find yourself in that gap you can become moderately rich over a period of several decades by living frugally and investing in index funds with excess cash.
Or don’t do that and don’t become moderately rich. That is fine, too! It’s not impossible but you must prioritize the goal of becoming moderately rich over other goals.