This kind of slow degredation of services is quite normal, however, this time around the wider use of these degrading platforms is hitting harder. Even 5 years ago, most communities had an IRC rather than a discord, and most ran a forum, or a community forum, with other info being on a wiki.
These days a lot of content that used to sit on a forum now sits on twitter, or on reddit. Discord is the new IRC, and so on. These separate services were a lot less convenient, but more resilient.
Odds are, we might see similar smaller communities pop up again as things get worse in the larger ones. Folks are pinched for cash at the moment, and so free services like neocities might see a boom as fandoms abandon larger sites (again).