I actually disable javascript yes unless I trust the source or can't avoid it, it's an easy toggle, I click many links during my browsing that I can't trust everything.

I do use "things I can't avoid" like google accounts, banking apps, microsoft products at work, slack, my question was with the intent that if you did get access to the source code as a paid user then that could be a good deal, since the "free" means "libre" not "gratis" and there can be FOSS paid apps, but with many good FOSS options already I don't see a reason to give away your freedoms even if a product is too good