[Jammin]

As a well-established prophunt player, having amassed roughly an incredible 57 minutes of in-game time, I feel qualified to give a side opinion.
TTT is a communication heavy game - there are certain gameplay aspects that come out via KOS's or proven declarations - things that may be time sensitive and are done via voice or text chat. Hence, clear comm channels are necessary for fundamental gameplay. By client muting someone, you run the risk of missing KOS's and potentially RDMing someone proven as a result. That's why mic/chat spam are not tolerated much, especially in alive chat. If you are going to play TTT, you have to be capable of communicating.

PH, on the other hand, isn't communication intensive. Other than taunting or hints on location, which are optional, the VC and text chat are there for social and assistance reasons. Thus, client muting random kids isn't an issue. Practically, the game could be played without sound. As such, the PH guidelines are more lenient.

The dumb vending machine has a good point about staffing standards, too - there really isn't much urgency in bringing more staff onboard, and before joining you'll be thoroughly investigated. We don't want nor need more trouble from staff members, which is why the current staff team is small but strong.