So it's not free to camp, we'll end up with centralised mega hosters (seedboxes in the tracker analogy) and in practice travelers will be too small time to actually be able earn any credits
Its also ripe for abuse; create dummy accounts that use their free stays to give a host credit, then the host sells those credits for real money.
On a certain movie tracker some invite selling scum would join via the signup process that used to exist on reddit, cheat a bunch of upload on popular torrents, convert that upload into bonus points, launder the points to their main account through a forum contest where they also gave away BP to innocent users, and buy invites to sell for real $ with the laundered BP. Similarly the dummy camping accounts could make sure to mix in some legit hosts as their free stays by picking hosts that may not be around/able to verify the dummy account stayed at their location (because it didn't).
https://en.m.wikipedia.org/wiki/XXXTentacion