It was not workable. They have a loss ratio of >100% [1], as in they paid out more in claims than received in premiums before even accounting for literally any other costs. Industry average is ~60-80% to stay profitable when including other costs.

They released the Tesla Insurance product because their cars were excessively expensive to insure, increasing ownership costs, which was impacting sales. By releasing the unprofitable Tesla Insurance product, they could subsidize ownership costs making the cars more attractive to buy right now which pumped revenues immediately in return for a "accidental" write-down in the future.

[1] https://peakd.com/tesla/@newageinv/teslas-push-into-insuranc...