I have rejected Sunny90 after acception

All was going well, sunny90 contact me and asked me to join LRW, after asking some questions like How much time will he be able to give to our Team daily. & some information about him, i accepted him as a member & i wrote his name in my profile at 6th place, But Third Umpire is seeing all this & send me email on my gmail about sunny90 his mail is :

"Hi abhi

Please be careful when you choose a team member. You must check score card of the members before they are in your team. Few users are doing spamming to score runs, e.g. sunny90 who is supposed to be in your team.

The score of spammer will be reduced at any stage, and this will held your team back and effect you and your team's performance. Each spammer will receive penalty scores and this should be considered by a captain.

Only team that will score maximum runs without spamming will be eligible for the final round of this contest."

than at that moment only i said sunny90, sorry & asked him to leave my team. But he dosen't replied, I have cut his name from Our team.Than i asked from webmater

"hello hiren
thanks, for informing me about it. from now i will choose team members who don't do spamming , But can you tell me how can i know after seeing scorecard that , this person is a spammer. Please explain if you have time."

than he replied ""Hi Abhi

You must go through the score card of the user, and try to see if they have uploaded duplicate content many times, received same or meaningless comments from other user just to score runs etc. etc. May be check their content. this will give you idea how the user is scoring runs."..

So i think i Webmaster is looking everything.