Why do we need strange sfa accounts on twitter?

Question

Twitter

Three million Twitter accounts from
https://twitter.com/intent/user?user_id=2000000000
name @sfa_2000000000 Protected tweets
from
https://twitter.com/intent/user?user_id=2002999999
name @sfa_2002999999 Protected tweets
Very similar between themselves, have a different number of tweets and other activity parameters.
What are they needed for? What does the abbreviation sfa stand for?

Answer 1

Alternatively, it is possible that this is for coordinating bots in a botnet. In this case, it would be necessary for the admins to signal that they cleaned it up.