Hey brian. Thanks for your input. I haven't thought of that, but as you have mentioned this, I totally understand your point. As a solution I maybe can suggest, that there could be some kind of tipping for cleaning implemented in the software when paying with crypto. Or there could be some kind of tipping box in the car (not sure if this is already the case of Uber cars, since I haven't used this service in Germany).
And yeah I've read in forums that so far that like 99% of offers are still in fiat money instead of crypto. I guess crypto in general is still in its infancy and less than 1% of people use it nowadays. I haven't used crypto for payments myself so far. Therefore we might need to wait a couple of years for further adoption. Projects like the DAV Network really encourages to use cryptocurrencies as payment, that's what I really like about.