you'll only get revoked if you host a v20 server on the v21 master server
correction: you will be banned from posting servers to the master serverin other words people can't see your servers on the join game gui
Which wont happen on Port's, because I believe it posts to a different master.
I wish I could play Blockland v20 on my computer, however I bought my game on Steam, meaning I'm unable to get v20.
All you need to play is your key. Have you ever played blockland before using steam or v21?if so, just go to blockland.us and ask for your key.