I don't think so, Mobike appears to have loads of bikes in some boroughs (Islington for instance) which I suspect they wouldn't get away with without approval.
Yes, I meant Mobike as being among the 'other companies'. Should have been clearer.
It looks like Mobike have agreements with Islington, Ealing and Hounslow (although plenty seem to have found their way to Camden and the like).
@Oliver Schick started
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I don't think so, Mobike appears to have loads of bikes in some boroughs (Islington for instance) which I suspect they wouldn't get away with without approval.