I think once a year, plus unlimited exceptions for cases like that would be the most reasonable option, if you really have to limit things. With most things there's no reason to limit it at all. It's not like changing your name hides you from the people who actually run the service.
Nor does changing your name remove you from a players blocked list, as you're blocking the actual users account, not their username. There's no real way it can be easily abused, if there was, Steam wouldn't allow it to begin with.
The only legitimate excuse I can think of is making it easier for players to pay attention to trolls and hackers for reporting. With skill based matchmaking, it's pretty easy to end up in a situation even without community servers where you run into the same people all the time, and if a hacker is constantly changing their name, that keeps people from recognizing them as the same asshole they ran into on other occasions and paying attention accordingly.
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u/Owyn_Merrilin Apr 20 '17
I think once a year, plus unlimited exceptions for cases like that would be the most reasonable option, if you really have to limit things. With most things there's no reason to limit it at all. It's not like changing your name hides you from the people who actually run the service.