The issue is what they do with our data and whether you'd be comfortable letting them use your data this way. It's also due to their shady practices like not disclosing changes to privacy policy. This is especially worse with non-technical people like my mom using their platform. Who knows what kind of bs they're peddling onto her wall.
I think it's awesome that people are finding ways to get off Facebook. It's like getting out of a heroine addiction or something:)