I bet the best (and quickest) way to become escrow is to reveal your identity (provably) ... e.g. meet in person with some trusted members, start visiting conferences etc.
Thats a bit overkill by me.
Users that are here for long years and became known are mostly trusted. That is less certain that u can trust that person than beign known as Andreas, but Andreas won't be an escrow for average joe member
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I would advice author just be here long. People will know you, get involved in some projects, then try ur strenght in beign an escrow which is hard job.