Morally it’s all to shit. Honestly the BTL market is a large contributing factor in why we need HAs and why social houses isn’t just druggies and scroungers who can’t be arsed, in fact with most HAs you need to be working.
I’m a former HA tenant, we stayed for longer then we needed too, but despite being too small for us really we liked it, our neighbours for the most part were lovely and the HA were excellent Landlords.
I can’t comment on the rest of the UK, but here HA rent it a lot lower than private, 40-50% lower I would say, they also sell new houses at around 75% of ‘value’ if you qualify.
As a system it worked well, for us and our neighbours we got a ‘functional, but not flash’ place we could call our own without the fear of your Landlord getting greedy and whacking up the rent by 20% a year or turfing you out because they decide one day they’d like to sell now. Rent went up at a set rate just over inflation. We managed to save up some money for a deposit and left for the next family to have a go. Some of my neighbours are still there, most have moved on to their own place.