[drivingmenuts]

I would argue opt-in for having your logo with the service, rather than opt-out, but it might be difficult to come up with a benefit that's enticing enough.

There's maybe some value in the logo owner being able to get information on who's using their logo (service not yet provided).

From the logo-consumer standpoint, it's pretty cool, though, it would be difficult to know if the logo is current enough.