And yet, the city is suing people/companies who violate the terms of use for public property. In the same way a landlord would sue renters who violate the terms of usage. So your point is
irrelevant.
It does so on the grounds that at no point do you have the legal right to rent out or sell the parking spot to someone else.
Let's start with the advertisement of public property for benefit:
Article 2. Unlawfully Placing Signs On Public And Private Property :: Penal Code :: 2010 California Code :: California Code :: US Codes and Statutes :: US Law :: Justia
556.
It is a misdemeanor for any person to place or maintain, or
cause to be placed or maintained without lawful permission upon any
property of the State, or of a city or of a county, any sign,
picture, transparency, advertisement, or mechanical device which is
used for the purpose of advertising or which advertises or brings to
notice any person, article of merchandise, business or profession, or
anything that is to be or has been sold, bartered, or given away
556.1.
It is a misdemeanor for any person to place or maintain or
cause to be placed or maintained upon any property in which he has no
estate or right of possession any sign, picture, transparency,
advertisement, or mechanical device which is used for the purpose of
advertising, or which advertises or brings to notice any person,
article of merchandise, business or profession, or anything that is
to be or has been sold, bartered, or given away, without the consent
of the owner, lessee, or person in lawful possession of such property
before such sign, picture, transparency, advertisement, or
mechanical device is placed upon the property.
And finally:
556.3. Any sign, picture, transparency, advertisement, or
mechanical device placed on any property contrary to the provisions
of Sections 556 and 556.1, is a public nuisance.
Alright, hope all of this was helpful. You have no right to advertise public property for the purposes of even so much as renting it without permission from the body which the space belongs to. In this case, the city owns the parking spot and provides it to people - you - as some guy from the street who has no clue how ownership or public property works - have no right to infringe on said property by trying to advertise it.