So many possibilities here :-)
I wonder how much it would cost to get threads.com...seems to be listed as unavailable on godaddy (of course they would be happy to try and get it for you with their brokerage service - - 69.99).
Don't sue them. They might never use it. If they do however, just wage guerilla warfare from the woods until they pay you to stop :-)
I may have another idea that is consistent with Web 3.0. Gotta mull that one over for a bit.
All in all, if they go with threads and steamroll us, all may not be lost. No such thing as bad publicity ;-)