One elegant taxation system to accomplish that is the land value tax: https://en.wikipedia.org/wiki/Land_value_tax
That's all well and good until someone decides to apply that reasoning to something else, like, say....the Internet.
You really think all that wireless spectrum is finding it's best use sharing cat videos? High-bandwidth video emojis?
They aren't making any more RF spectrum either.
One man's "common sense solution" is another man's "free market distortion".
And there is PLENTY of land to go around....so.....bad example. You could give nearly every single person on the planet plenty of room to live in Texas. That's without going vertical into multi-story buildings.
Ultimately the best use of people's labor is whatever they want to do with it. If that's buying houses, great. Beanie babies, faberge eggs, gold ingots, whatever.
Do you really need all that crap you own?
The rest of your post is non-sequiturs that I'm not going to bother engaging.
It's treated like real-estate with RF "zoning rules".
But very wide swaths of the RF spectrum are essentially a free -for-all. You could argue that the most valuable parts (UHF) are used for stuff that could only be described as "non-essential" e.g. cat videos.
Not even as a hedge against whatever is going on in their country?
On that point I mostly agree, though I'm sure there are some small benefits that accrue - almost certainly cancelled out by the disadvantages though.
That said, I think the old "unoccupied houses" thing is way overblown. It presents the most ugly side of foreign real estate ownership so that people who are priced out of the market get angry at all of the foreigners buying property. Even if you removed every unoccupied SFH (single family home) from the market, prices, generally, would still be rising.
It's sort of like saying that the reason that a car costs so much is because the demand is high based on too many families owning more cars than they need. It gives people a target for their dissatisfaction with current auto prices but really isn't the main issue and even if you solved for that issue it wouldn't dramatically impact auto prices.
But having a target for your anger is a wonderful way to distract people.