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I recall my first Signature Campaign ending up being a fiasco. I don’t really care that much for not receiving the tokens (it was pretty much experimental for me), but rather more on a personal level for the fact of having giving some visibility to an ICO for over four months, that turned out to be a fiasco for both investors and campaign participants.
Now did I do my homework? Yes, to the (worst/) best of my abilities at the time, without going too deep into the research, but enough to believe that the concept solution was more or less feasible, backed by a team that had won some flashy awards, and that seemed to provide a market solution that was not artificially fabricated.
I more or less did check nearly all of the things listed in the OP, except those related to payment since, as most token-based campaigns do, they only rewarded the tokens after the conclusion of the campaign (which, of course, they never did in the end). I did see a couple of warning flags I should have read into deeper, but the positivity surrounding the project seemed to outweigh the yellow flags (not forum Trust flags, but conceptual flags) I’d seen in the struggle between positive and negative reviews. Turns out the negs were right, albeit being heavily outweighed …
After that experience, I went on for quite some time with no signature, preferring a blank stare from signature and avatar, to repeating a similar deception with another ICO. The current campaign is my second one on the forum, and for the most, represents an aspirational one in terms of prestige, seriousness with the payments, and very well managed. Besides that, you can wear your own avatar (which I created for the 10th anniversary art contest), being my account avatarless before (except for the period of time running for the ICO I was on about before). Unfortunately, there are not many akin, and more often than not one will need to settle for an ICO bearing an unknown/uncertain token.
Bottom line here is that yes, try to be picky with the campaign you represent (if you can), scrutinize viability and things such as those explained in the OP, but eventually you will be (hopefully) improving your chances of not getting ripped-of, but never getting to a point of certainty where you are guaranteed anything. It’s a game of chances, and it’s in one’s hands to better the chances, but not to be a clairvoyant of the exact outcome.