You can’t stop altcoins from doing it, because they’re not decentralized, but you already did one important thing by sharing your own experiences to others. So another thing you can do is to keep your friends and family out of them, by putting the facts on the table, so atleast they won’t get scammed. And i dont see the point why people put themselves in vulnerable positions, voluntarily, and still go into these projects, decentralization isn’t just some cool buzzword, but a protection against the wickedness of man, and you should never accept compromises to decentralization, when it comes your money(time). Human stupidity is probably the only infinite thing in this universe, so why elect human leaders to decide about our most valuable asset(time), it just never works out for the majority.

Now to Bitcoin, if an BIP like this will be introduced in the future you can engage in the discussion and give valid points. Then you can always run a node to make sure changes like this won’t run on your Bitcoin. Also i dont see a scenario in which miners would vote out their own business model.