It will only work if poorly behaved riders are banned for life. This is the reason I avoid public transport - drugged up homeless stabby grifters are on the bus, not in my private vehicle.
1) Minibuses are small, essentially their space is divided into personal zones and cannot serve as a residence for homeless people like large buses or subways;
2) Access to such a bus can be personalized;
3) The adaptability of the route means its unpredictability for a fare evader, even if they get in, meaning such transport is inconvenient for fare evaders;
There are probably more solutions that I haven't considered yet.Visited LA during the pandemic so bus rides were free.
Getting around LA via busses and rail was incredibly smooth and affordable.
The stench of shit in the subway car though was off putting and I have to presume as long as people can afford to avoid that they will.
That said, paying people to keep these things cleaned would supply people with a potentially life long employment by a city (so receiving public retirement plans) which ought to be a net benefit for the city as a whole.