My office landlord also has two small flats above (think glorified bedsits) and his partner also rents out a tiny cottage. This is their living (aprox. £3k a month), neither works or has any other business, all from a 'portfolio' of properties that maybe cost £150k twelve to fifteen years ago.
As an example of market inefficiency, multiply this across the country and it's not hard to argue that the housing market is severely broken.
What about instead of shifting from private parasitic landlords to corporate parasitic landlords, we just let people buy the homes they live in (by enacting one of many possible policies to limit the profitability of BTL and thus reduce competition for homebuyers)?
It just doesn't seem to make any sense to try and apply free market principles to housing. There's absolutely no benefit.
[0] https://www.theguardian.com/business/2021/aug/19/lloyds-plan...
[1] https://www.theguardian.com/business/2021/jul/04/john-lewis-...