I think the core of the issue is "pricing as a service" is anticompetitive and should be banned. These service providers likely siphon up tons of data (and probably sell it to other similar service providers) about the market which would otherwise be proprietary business information and are used widely across landlords.

It promotes a perverse incentive for everyone to share business information and have the same pricing models and for the model to promote rising prices consistently across all landlords.

It should be banned because the incentive structure discourages (or eliminates) competition.