Thanks for the intel ! Its a bit awkward too to ask for an invitation at start I guess, a novice kinda have to hope a mentor have the habit to do it. Wich is risky too because of the risk of invinting a rmt bot. I can't see another way around that said. You can't give the novice the ability to join because of bots without a AI-proof system...
As a thumb rule I let the fights goes to let people learn by themselves and because its easier to give advice and strat info about something he saw rather than something he'll perceive as abstract and if the novice/first timer get some difficulty I start giving advice here and there depending on the problem.