This is stupid on so many levels. There's the obvious idea that governments shouldn't be involved in telling people what they can do on private property (I can see the argument that community associations or designated areas could have special regulations, and I expect they already do, there are no billboards on the pyramids).

Almost worse (as it is always for dumb ideas of this kind) is the enforcement. Are we going to have a whole system of definitions of what is billboard (when is it just a poster), jurisprudence, inspectors, etc. The kind of 0th order thinking of '"they" should ban X' has no relationship with reality, even if it sounds like a good thing if you dont think about it (personally I hate advertising) This is the same class of stupid idea that makes no practical sense that we see in various populist political campaigns

Edit: I have to admit, I didn't anticipate so many seemingly angry (and condescending - the guy talking about animal cruelty laws and "we encode complex things...", lol) replies. Anyway, the above is just my perspective, I guess if you want your tax dollars working towards something like this, there is a pathway to a billboard free future