In this case, the law doesn't apply equally to everyone. Holders of existing taxi licenses actively lobby to restrict the issuance of additional licenses. This isn't new: https://www.eurofound.europa.eu/observatories/eurwork/articl...
Allowing a corporation to just ignore existing regulations while everyone else is respecting them is a completely different story.
Let me add: I have very little sympathy for the taxi drivers guild and their practices, but I don't think that's a good reason to allow Uber to operate outside of the law.
Why do you favor one rent-seeking monopolist over another?