I don't think anyone ever accused them of stealing that money, but yes, hijacking people's personal brands to collect money without their explicit knowledge is a bad thing.
Imagine if I saw the icon and gave "them" money via Brave instead of joining their Patreon or some other official channel that they explicitly set up. If they don't collect, then yes, I might get my money back - nothing was "stolen". But that was money I wanted to send to the content creator in that particular moment, and that creator will probably never see it. The creator got screwed out of money that otherwise would have gone to them.