for now i can't really see AI becoming a companion, at least personally, simply because it's not self-aware... it's just a program doing mimic, but it's not aware to exist, it doesn't have time perception and such. If we will ever achieve a sort of cosciousness then i would like it as a companion
for schools it could be good as a teacher, but nowdays kids use chatgpt to solve homeworks which is not really that good