Yes, actual rents of all units under management, specifics about what properties are vacant, when properties are available to go up for lease renewal or open market, and I imagine also detail on deferred maintenance, to aid in deciding when to renovate which units. Would not be surprised if they take demographic data too. The more you share with RealPage, the better the recommendations you receive, and the higher your unearned income.

And no, these are not routinely shared publicly. Landlords are allowed to open their books, but for-profit businesses generally do not do so without specific incentive, because it is more profitable to keep trade secrets. Even if they wanted to, how would they do so? I'm not aware of a nonprofit data hub for them to dump all of this for public consumption (and if I don't know, I'm confident random slumlords in Cincinnati also don't). Maybe RealPage can make a free and open one if they are so committed to just making good honest tools for well-informed market participants.

The publicly scrapable data is: advertisements to prospective new tenants for the buildings who have tenants that recently announced their intent to move (or were evicted). They frequently won't even have specific unit numbers attached to them. They only have to be accurate enough to solicit inquiries and not get the landlord sued, an extremely low bar, especially in a hot market (where RealPage reaps its profits). The data availability is night and day.