In the parts of the country I lived in, I've never seen big corporations own single-family rentals en masse. They usually go for apartment complexes, which are far more profitable if you have the capital to buy / build one. Commercial real estate too.
If you click around your neighborhood, a lot of single-family homes are owned by living trusts and "Bob & Kate" LLCs, but that doesn't mean there's any hedge fund money involved.
I just sold a house to a big corporation that owns about 12,000 homes. There's a whole industry for enabling these buys, opendoor, offerpad, etc... It's usually a wash selling your home as is to a wholesale deal vs. prepping your home and selling it, the difference being done about 60-90 days faster than via retail.
The company I sold to already owned four houses on my street. It's crazy.
I really hate the idea of selling to these "we'll buy your home fast" shops, but I have to be honest that had I needed to make that move, it would have been a very real possibility.
I'm not saying that site isn't potentially useful as a starting point to find out some stuff, but it hardly seems worth influencing a major decision like what legal entity to purchase a home with.
(edited to add): It also says there's no public record of me being married, which definitely is not the case. My wife literally co-owns and also lives in the house it lists me as living in (and has the correct purchase date for it), so you'd think that whatever algorithm is used to build the dataset would be smart enough to see if there's any other ways we're legally tied together. It also says it doesn't have any records of business associations I have when last year I registered a single-member LLC for contract work last year. The LLC literally has the same name as me followed by " LLC", because apparently no one else had registered that before in my state, which at least gives some evidence that my name isn't overwhelmingly common.
Until you have a stalker who will harass you, your parents, siblings, grandparents... and that stuff isn't all that uncommon.
If you do have a lot of capital ($100M+), you don't, because you can spend that money to build or buy an apartment complex that gives you something like 5x as many tenants per dollar spent. And is cheaper to maintain in the long haul.