Fully agreed. While it is morally positive to avoid especially unethical companies, ultimately it’s not possible in all cases. As long as you try to be moral in your day to day actions and you on some level push for things to be better, you’re not morally culpable for the failings of the current system.
Discord isn’t a good alternative, it’s not the same type of social media site. Discord is more of a chatroom aggregator, while Reddit is more of a forum aggregator. While Reddit technically supports chats and Discord technically supports threads, in both cases they’re clunky and not the main point of the site.