They call it a common gesture of courtesy to inform people that your home would offer itself to those fleeing some kind of devastation (oppressive regimes, abuse, earthquakes, etc.). However, most people don’t end up in that kind of humanitarian role. What’s the closest you have come?
I sent in multiple google forms to the group coordinating Ukrainian refugees in my vicinity when they put out calls for housing. I didn’t hear back from them any of the times, I may have been too rural for it to be viable.