I personally think that a user should have to have a staff member or curator approve it when a user wants to block another user. I’ve been blocked by multiple users, and it’s always because I voted an escaped captive animal wild (which is what you are supposed to do). Some of these users have a huge volume of observations and it really bothers me that I cannot see them or ID them.
I understand blocking has some legitimate uses but I am willing to bet that 9 times out of 10 blocking is unjustified.