This debate has been given attention recently following the decision in the German courts overruling a ban on drivers-for-hire utilising the smartphone application ("app") known as "Uber" which provides users with access to vehicles on a rideshare basis.
BEWARE: If you think you avoid an onerous obligation by merely saying "I’ll use best endeavours" - think again: the Courts treat that as a strong obligation, not just a good faith statement that you’ll try.