Which projects are using Substrate, but keep it "secret"?

I'm chatting soon with a journalist and wanted to slip this information to them: Many are using our great tech but are not mentioning it. Of course, it's their choice if they don't want to be associated with Polkadot/Parity. But for an outsider, it would be very interesting to see who is "stealing" code from whom.

I've heard Cardanos Midnight is built on Substrate, but I only found some evidence here.

Thanks for crowdsourcing some names here!