Well, considering that these won't allow anonymous usage this can be mitigated by kicking out "bad" users and big fines. Also cars can visit the cleaning zone frequently.
For "free floating car sharing" (DriveNow/ShareNow, Yandex.Drive, ...) this seems to work quite well.
For "free floating car sharing" (DriveNow/ShareNow, Yandex.Drive, ...) this seems to work quite well.