Tapping the sprint key alone does not reset your sprint state to the server. Your sprint state desyncs with the server after attacking something, this is sometimes considered a bug in the game itself, but there is no vanilla mechanic to resync it besides releasing the forward key, blocking, or sneaking which all slow you. So if you’re somehow resetting your sprint and not slowing then you’re doing a non existent game mechanic, it’s detectable. If a server doesn’t ban for it it’s because they’re not checking for it yet.