Soooo accurate, lol. At least they occasionally have useful echo chambers where it's not constant Kardashian or political news interruptions. They're a lot more akin to BBS/forums than any of the others, but still attract a lot of edgelords and attention whores.Reddit serves as an aggregate and a place to tell on yourself for how much of an asshole you are.
IG is kind of vestigial at this point, but originally they were the easy mode personal media social platform for smartphones. It's strange they have held out so well, but I think a big draw is that they simply still have the large user base.
All of them are trash. Nothing intelligent happens on any stereotypical social media platform, it's all lowest common denominator mind viruses and dopamine facilitation mechanisms. You're the product. That's why it is "free". Personally the cost is not worth it.