Sonder Raises $135M to Turn Airbnb Apartments into Hotels 8 years ago
I am not sure if they will ever be acquired by AirBnb, the main difference is that they either own the apartments but most likely They have signed long term leases on the apartments, this is a completely different model than Airbnb.
They're much more closer to WeWork' Business model. This is typically a vertical where WeWork could make acquisitions.
The space is quite competitive, and a company like https://www.staylyric.com/ is doing pretty much the same thing.