Bill Gates isn't buying SFHs. He's buying all the farmland he can. He's the largest owner of American farmland.
There is 900 million farm acres of farmland in the US. Bill gates owns about 270K acres of farmland. So even though he is the largest private owner of farmland, he owns less than 0.1% of all farmland in the US.
Ref: https://apnews.com/article/fact-check-bill-gates-blackrock-7...