I shared those concerns at first - as that was similar to my situation (though less lgbt+ but more just on-the-spectrum stuff), but if the article is correct then I find myself strongly in support (so-far...): my impression is that this is targeting the kinds of vacuous mass-market "engagement"-driven social-media services that us HN denizens aren't exactly fans of: Facebook, Instagram, the like. The article says that sites like YouTube and IM services are exempt.
> Messaging apps, "online gaming services" and "services with the primary purpose of supporting the health and education of end-users" will not fall under the ban, as well as sites like YouTube that do not require users to log in to access the platform.
-----
For an anecdote: when I was middle-school-aged and unsupervised on the net, the "mainstream" platforms of the day (AOL Groups, I guess?) were just as unappealing then as Facebook is today (fortunately I wasn't on AOL anyway) - instead I found my home in places you get to via IRC - or extremely niche phpNuke-then-phpBB sites: these places aren't run by companies, just basement-dwelling sysadmins so they'd be exempt I imagine, so it doesn't look like any harm will come to those kinds of places.
For those youngsters-that-dont-fit-in starting their journey of self-discovery, I think getting banned from Facebook is a good start. Who wants their parents (and let's be honest: it's only our parents on Facebook now anyway) to get notified about your joining a cybergoth meetup group.
...now if only we could ban everyone else off Facebook too.