And if you look closer at the verbiage and the way they are known to operate, you are highly likely to be "on the clock" for 50 but only paid for 40. Then deduct standard taxes from that and you end up with way less than if you had been smart about things and they paid fairly per mile, etc.
Considering how clueless the lawmakers are here in the states about this stuff (despite best of intentions), I wouldn't expect this arrangement to be any better than being free to cherry pick the best offers, best times to work, etc. The beauty of being IC is being able to say fuck that, not doing that one. What I fear about this is that the gig workers will have to accept bullshit offers to keep their metrics in the right zone so they don't get "fired".