"The ghosted knows it is clearly emotional abuse, whether it happens once or it happens continually." — tbh, I have been ghosted before. I have also had professional therapy, and I have researched abuse. I would still say that ghosting is not emotional abuse.

"By staying in the relationship" — if someone has definitively ghosted you, there is no relationship.

Yes, it's painful, and it's very inconsiderate, but the fact that their disengagement from the connection has wounded your feelings doesn't mean they're abusing you. (Or, more simply put: if someone ignores me because they want nothing to do with me, it's not "abuse" just because I'm sad/insecure about getting so impolitely rejected.)

I think you saw me outline in a separate response though why I consider ghosting different from the abuse that is stonewalling, so I won't bend your ear by rambling further. ;)