people dont hoard food to make the supply on the market less though.
throughout history. society has not been kind to people who tried this. scalping staple foods usually leads to bread riots. and because food is absolutely biologically required to survive, those usually turned very violent.
They do, to varying degrees, just not enough to be noticable. Commodities traders buy and hold all the time. The thing about free markets is that you need a hell of a lot of collusion to do what you're suggesting because someone always stands to gain from misguided speculation.
This is actually exactly the issue with housing. The market is controlled by municipalities who are elected by NIMBYs. The only reasonable thing to do in these conditions is to buy as much housing as you can, since your assets are protected from competition (local densification) by the government. We've literally regulated ourselves into this crisis. The solution can't be more regulation.
Regardless it's extremely affordable for most people