It’s up to the individual developer what they want to do. Expiration is not something that is part of the Grasshopper plugin framework, so if something happens in this area it means the developers put in some effort to make it that way.
I wouldn’t expect too much from the two developers. They had written most of their plugins as students (under Patrick Schumacher), went their separate ways after leaving university for good, and seem to have lost interest in their plugins. At least, they haven’'t updated them.
I know to (from uto) a little and he’s a pompous jerk (pardon my French)!