AFAIK ShinyHunters has some overlap with Scattered Spider, The Com, and Lapsus$.
The ones who've been unmasked haven't been sophisticated criminals, they're literally Discord teens trying to outdo each other.
Some have been American, others British, French, and Brazilian. At least one has been extradited from France.
It's a pretty odd community. I would expect most of these kids are smart enough to work a regular job when they graduate, it's wild what the allure of clout will convince one to do.