Not just you. It's a thing.

Even more extreme, consider that companies that do charge money drop the ball constantly on security/privacy, and basic quality. And yet they continue growing, maybe having a bit of churn.

I think there's something about generosity that just attracts entitled bullies/leeches because they see it as an opportunity to "win" against people who are "foolish" (aka "weak") enough to work for free. Sadly sometimes the generous are duped into considering such requests out of curiosity or politeness, which leads to burnout or worse.