Free isn't good.
You would get the homeless using the streets for a living space.
Things whose use is not inherently self-limiting should not be free.
FTFY.
What is your proposal to collect street use fees from users?
Perhaps we should worry less about restricting supply, and more about reducing demand - after all, you are (rightly) unconcerned about
people who have homes using free buses "for a climate controlled space".
So maybe your "problem" is not to do with buses, nor with free access to "Things whose use is not inherently self-limiting", after all...