@LadySuzanne has done a pretty good job of outlining reasons, and as @DaveCozy said you will probably never know. Suggest you join a team who are clear with you about what their requirements are. I could suggest (ahem!) "All Zeros will be Kicked" have one spots available. As the name suggests we are fairly upfront, but joking aside, joining an alliance is a covenant, make sure both parties understand what they want from the relationship. 
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