People don't have an obligation to use big social media just as you don't have an obligation to use your friends' social media. Use what works for you.

Personally, I envy people who don't use Discord. I try to avoid corporate platforms, and I also hate some of the design decisions and the Discord Nitro being shoved in my face, but most of my fandoms pretty much only exist there, or on sites too toxic for me to even consider joining. I wish I could convince all my friends to join me on Signal or Matrix, which I don't even think are that obscure, and all those fandoms to move back to web forums, but that's a hard sell for a lot of people.