They are likely created by bots months ago.
Then, after the launch of merit system and related new rank requirements, those accounts have become useless; especially with the demotion of Junior Members that don't have 1 merit at lest in September.
The kind of tasks are not too popular.
Because I saw lots of fake accounts in the service section. They have only 1-3 activity. They create those account for doing only small tasks like survey tasks, Registration tasks etc.
I don't think so, they are able to create real emails for their accounts, certainly. Of course, it will force them a bit pressure, a bit harder works, but generally your suggestion will not really, and completely solve the issue.
If there were an email and phone verification system for registration process then it can help us to stop useless fake accounts.
In my opinion, they are annoying, not dangerous.
Annoying because they tend to use those fake accounts to spam everywhere at the right time (right time, in their opinion).
Nowadays Fake accounts are very dangerous for us. They can do various illegal things and it will damage this forum. So always stay safe from fake accounts.