Some people use it to maintain contact with long distance friends and family. Especially in scenarios where other methods are prohibited by time zone and expense. It's also been used by whistleblowers to expose government corruption and illegal corporate machinations.
Just because it's primary use case has been altered to favor brainrot and slop doesn't mean it totally lacks value or usability for other uses.
It is my belief that the optimization of all the current platforms towards advertising revenue has destroyed the value of these platforms for those other uses. Meta is so concerned with appeasing advertisers that it will happily suppress important free speech and, at the moment, Instagram is suffering a scandal because they introduced an antifeature that does nothing but kowtow to Trump.
I don't disagree that networks are needed - I don't think that any of the networks I mentioned can serve that purpose however. They are nothing more than slop shovelers that perpetuate outrage and disinformation.