(disclosure, I work at google, and previously at YouTube)
This allows a user to donate to a content creator even if that creator doesn't have any way to get access the donations. That is, until youtubers start registering themselves in the payment tool, this is essentially watching someone's video, and then throwing money into a hole.
With other patronage systems, like patreon, you cannot donate money until the creator has an account. To me, that feels super sketch.
Edit: It reminded me to go and check my old bitcointip and altcointip accounts on reddit, on which I apparently had combined closed to $30 in BTC at today's prices, but which have both been shuttered and are now inaccessible. That's not promising.
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