We encountered the same last month. Google came to the rescue when I didn't find anything on FT. As stated, it does seem to be a scam. I had suspected (and witnessed) that they ask for money after you sign, and it was clear that some of the people at least are not deaf etc.

Some websites, however, go one further and impute that they try to pickpocket you while you are busy signing the petition or saying no to pleas of money. Didn't witness that myself, so can't corroborate.

Does seem best to ignore, however.

My general feeling is that if 'a cause' is willing to accept my signature, even without taking time to explain the motivation, then it's not worth supporting.

tb