Quite a few alliances are permamently suspicious, so they won't recruit those they do not have a 100% certaintly of who they are.. or who they are not!! (I think these alliances have had their fingers burnt in the past with their recruitement)
Others, including Nemesis are careful on recruitment but not paranoid. What I mean by that is we recruit, but want to see 2 main things in a member... 1. potential ability, 2. loyalty to the alliance, 3. likely to keep playing. (sorry thats 3
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Nemesis has allowed alts in, the only things I ask of alts is that I know the main account. Another reason that we havent the paranoia is that we havent anything to hide in Nemesis, we dont plot behind peoples backs so there's nothing really to spy on us.
I will say that currently, there are not many active alliances, so your choices are low.
If it comes to it then I'm more than willing to put an alt in an alliance or even start a training one (though I'd really need help due to my limited play time)