No one, they dont even have enough parking for them to all be idle simultaneously. The airport rental agencies near me have been renting out all the stadium parking nearby to use as overflow storage.
On the capital side, one of the biggest assets for rental companies are their fleets. The sell them as used cars. With nobody buying cars at all and the glut of unsold new cars packing lots, those fleets are being revalued at much lower prices. It’s a double whammy.
Yeah, I saw on reddit last month a possible insurance scam in which 3500 rental cars caught fire in an overflow parking lot in florida because they are all sitting around unused [0].