Same here; evidence I have to support is that the ONLY people with (newer) cars [1] were Airbnb hosts. My host not only owned a late-model Suzuki 4door but also was getting into the business of "flipping" old apartments into Airbnbs/Casa particular. Since he had 24 hour access to the internet (somehow?? [2]) he also acted as the agent for other Airbnbs for people that didn't have access.

[1] Of course there were people with the old cars, but these were passed down and are, as I understand it, required by law to act as a mini-bus service.

[2] Although internet in Cuba is only officially available by buying a hourly code on a scratcher card from the telephone company and then Wifi is in the parks in Havana, I did notice bootleg Wifi SSIDs when walking the streets. They were easy to spot even without "war-walking" since they are a good 1/2 km from any nearby park and had usually a dozen folks on their phones browsing Facebook or using Skype. I suspect it's either an insider connection at the telephone company OR a clandestine Directway / Hughesnet satellite (there are NO visible dishes in Cuba, I believe it must be illegal).