If you reeeeally want to stretch, they do have rules about pricing things lower on other platforms. Like, you can have a sale on your website that makes it cheaper than Steam, but can’t have the base price cheaper there than on Steam. That’s about it.
These are very region dependant. My state has no income or sales tax, but the property taxes are higher, my 1 acre with a mobile home is basically 3k. It’s almost certainly cheaper than renting, but you can’t just make sweeping statements like that.