I have not yet had time to find a suitable replacement machine. But running a bridge is a cheap, safe low network volume method people can help out from home. I had it going to help people in 'bad' countries to get out to the rest of the world.
A lifetime ago, I ran bridges from RAM only distros. But early versions of the Dan list (1st in wide use) killed that.
DL didn't try hard to differentiate between bridge IPs and exit IPs. Server hosts just grabbed the first list they saw and blocked with it.
It was years before the notion of Exit != Bridge became understood but everyone had moved on. We're at the entropic 'No One Cares Anymore' phase now.
Good question. I was probably running Tor-ramdisk. I just looked around can't find any reference that it could serve as a bridge.
From that I infer I was running as a relay.