It doesn't block your ability to learn any more than any auto suggestion systems. But I guess it depends on what you value in terms of learning, for me, copilot allows me to focus on the larger architectural problems while not having to worry about the exact syntax of certain things (DSL query language, middleware express, typescript def annotations, etc).
Every time I don't have to context switch to look up some technical errata in my browser is a complete win for me.
I observed one guy become very resistant to reading the docs as they believed copilot obsoleted them. Programming in Ruby, the copilot suggestions will run but since you didn't read the docs you won't know that the output doesn't actually work or doesn't do what you think it does since it was intended for a different situation.
Every time I don't have to context switch to look up some technical errata in my browser is a complete win for me.