Actually, this change would’ve affected everything originally. They said Personal was now the default, and they’re tracking the charges by engine analytics, so they’d have the necessary info regardless of install method.
That said, they’ve updated the fees to now be revenue and installs, rather than either, so free projects should be safe for now.
I’ve seen a few that delete their stuff after the month and never release it again. IIRC, at least one of them was making relatively huge cash per month and only ever released cropped previews publicly, so that one was definitely what I’d call predatory, but that is just the most extreme case I’ve seen. I hate that false scarcity works so well.