The bits AUP is not an inscrutable tome written in a dark script no mortal can contend with.
“You may not sell or transfer Bits to other users of the Twitch Service, or offer Bits in exchange for real or virtual currencies or any other consideration or items of value whether inside or outside of the Twitch Service. Accordingly, you may not sell, barter, or trade any Bits, or offer to sell, barter, or trade any Bits. You may only purchase Bits from Twitch, and you may only use Bits on the Twitch Service as authorized by Twitch. Any attempted prohibited sale or transfer will be null and void.”
The bits are bought on Twitch, used on Twitch, and they do not go to the person invoking the command, but instead the caster. There is no exchange of currency and bits, and so I don’t see how this could possibly violate the AUP.
Hilariously, the AUP also states
“Improper and/or inappropriate uses include, but are not limited to: … Giving Bits to a broadcaster as a payment substitute to a broadcaster, or in response to a request for financial support;”
When was the last time you heard of Twitch hunting down casters who say they’ve been having a rough time financially and getting bits because of it? I’ve literally never heard of Twitch going after anyone for that ever, even though it seems to be far more clearly in violation of the AUP than donating to yourself. (Even through a third party.)