I wish that were true today. Charitable donations get into the news as noteworthy because they are rare, and they don't hold a candle to the aid that governments provide. And the reason for that is exactly what your original statement was, people don't want their money taken away and given to someone else. Many people don't even want tax dollars to go to help "those people over there". Changing that at a cultural values level has been an ongoing struggle for a few hundred years, with no end in sight.
This is why most serious UBI proponents are trying to identify revenue streams that don't take money away from person A and give it to person B. Having a government or other collective economic entity set up a Bitcoin miner and distributing the profits to all citizens within that municipality would be an alternative that wouldn't be coerced at all. It would just be part of the system.