I'd be careful with the way you position it. If its exact match to something they end up branding, sending the “hey I own your name” email can go from flip to headache pretty quick.
Best move imo is just keep renewals cheap, don’t park sketchy gambling ads on it, and wait for actual socials/site/LLC filings or repeated promo. If they really push it, inbound will come without you chasing. If not, you're only out reg fees instead of building a whole plan around streamer vaporware.