mytaxi already tried to introduce variable commission with rates of up to 30% in Germany but had to reign back a bit when faced with resistance from drivers, erm. As we will be backing the firm we're not going to resist, we must accept that it knows best. Have you considered the logistics, talk is cheap but how will you help the Unions enforce the agreement?
Whistle seems to be the very idea that you are looking for, a taxi app that exists as a taxi app without the need to satisfy a broader strategic agenda.
Getting drivers to agree on the colour of shite would be an ambitious exercise for a team of accomplished diplomats, the prospect of you delivering our consent to Germany only exists in your imagination, it is a theoretical discussion!