You should be much more concerned about tying transportation to a company that _is_ profitable. The point of public transportation is to provide an external benefit. Uber will just interpose itself and extract rents.
There is no mention of such a benefit in the comment you are replying to. The point is that the qualifiers you applied in your original comment should be less worrisome than their opposites, which is not to say that they shouldn't be worrisome.
Because those companies would be in less of a position to have the effects described in the original reply. I would like to help you more, but I don’t know what is confusing.
What about the extraction of taxes? The government has already imposed itself and setup a coercive monopoly for transportation. They are the ultimate in extracting rents.
