That’s true to an extend, but the interactions are only useful for training if you can mark it as good / bad etc (which is why sometimes apps will ask you if they were useful). But the ‘best’ training data like professional programming etc is usually sold at a premium tier with a promise not to use your data for training (since corporations don’t want their secrets getting out).

They’re further left than not voting

I think the main point is that the Democrats are all those things, and yet still more effective than you at pushing the country left, so people support them because it’s better than supporting Republicans