That's not new; it's been happening all the way back since AOL. AOL was basically an abstraction layer over the whole internet that we tolerated (remember when every show had both a URL and an AOL keyword?), but it broke like anything can.

For that matter, your maxim also applies to the open internet, and watch what's happening. It's not profitable, so sites are packing up.

In a nutshell, content costs money. People make content anticipating money. Doesn't matter if it's on Discord, on YouTube, or a private blog. No money, no investment.