I wonder if #ActivityPub could be used to federate BeWelcome with other platforms for non-commercial hospitality-sharing (unlike AirBnB and BookABatch which are commercial)? I'm not sure how many there are, or how compatible their goals and systems are, but I know there is also HospitalityClub.org, HelpX.net, WarmShowers.org, Workaway.info and the various WWOOF schemes.
@strypey I spoke to devs. of trustroots. They do not have really any interest in federation.
Thought this might change if a dev steps into their circle doing a proposal and being able to do the work.
If not, maybe building a new one that starts as a 'couchsurfing for fediversers'. (hubzilla with it's plugin system might sounds suitable build on top of it. )
@paulfree14 ... and a huge database of people willing to share their homes with strangers they just me on the net. Which is by far the complicated part. I don't think it's worth further fragmenting the space by starting again from scratch. Some things just don't suit the federation model, and maybe this one of them? After all, there's a lot of trust involved ...