It will be working till new update, then the developer should revoke if current API key and create a new for the new version.
Aver that it should stop work
Depending of your instance, see the local communities, you should have some for “community request” or meta, look for the description of the communities.
You can also request on other instance, doesn’t need to be on your instance. Some can be more restrict then others.
There’s also theme specific instances, like Star Trek, Path of Exile, FOSS… each instance can have his own rules.