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There's a whole raft of concerns to consider about this (most of which I was discussing in the news thread earlier). There's the potential for abuse of the data harvested (both on donors and the recipients), there's the effect it might have on those who don't opt-in, there's the possibility that it creates a market where people make money from the existence of homeless beggars (and so a financial incentive to keep the "workforce" in place).
Any time tech moves into virgin territory, you really have to think of all the possible unintended consequences. If you don't, the market will find them anyway.
Council plans to barcode the homeless. I wonder what Kim Wilde would think of this sort of thing?
https://www.bbc.co.uk/news/av/stories-45102437/would-you-scan-a-homeless-person-s-barcode-to-give-them-money