Replication and user privileges

I have a question about mysql replication. I believe I understand most 
of it, but have a question about user privileges.

I understand on the master, the replication user must have the 
Repl_slave_priv privilege as described here:
https://dev.mysql.com/doc/refman/8.0/en/privileges-provided.html#priv_replication-slave

My question is about what replication-related users and privileges must 
exist on the slave.

So, for example, if an insert on the master that is to be replicated is 
performed by user 'abc' with proper insert permissions on the master, 
does that same 'abc' user with same insert permissions need to exist on 
the slave as well?

In other words, what user is performing the replication operation on the 
slave? I don't see any indication of users referenced in the bin logs 
that I have examined on the master. Are user and privileges regarding 
replicated queries irrelevant on the slave and that is handled all 
internally via the replication thread with no regard to user privileges?

Thank you.
Jim

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