Like in a housing shortage you’re hoarding property and profiting off it.
Housing shortages are caused by bad government policy: namely, low-density zoning. Direct your anger towards the entity that deserves it, and make them fix their fuck-up.
(Note: I’m not making some kind of Libertarian “all government is bad” argument here. I’m saying that in this specific case, the laws need to be changed.)
There is enough empty property to house every homeless person 30 times. Some of those empty property are summer houses and shit, but even then the problem isn’t the lack of housing, it’s treating homes as a mean to make money out of people’s basic needs. You can build the best walkable city in the world, but if it will be bought by professional landlords immediately it will not solve shit.