There are viable alteratives, but they aren’t making money and can’t advertise. Signal is a prime example, its an amazing platform with feature parity + more to Discord. Regardless of how well a platform is polished, you need users. People will use the shittiest platform ever if it has users (Twitter and Reddit come to mind).
Genuine question who is still using snapchat. I deleted my account ages ago, not because I was on my privacy crusade like I am now, but because I noticed all of my friends stopped using it and everyone else on there was like 5 to 10 years my junior.