I'm surprised they haven't tried to monetize this data ... yet.
I'm not saying they wouldn't, or won't, but they may have learned their lesson about the fleeting nature of intellectual property.
Thirty years ago they (and their stats services) were very proprietary about the official scoresheets that provide the basic stats that we nowadays take for granted at baseball-reference.com and other sites. Ever heard of Bill James? James is known for pioneering work slicing and dicing data back in the 1980s, of course, but what he also did in the mid 80s was start something called Project Scoresheet, aimed at getting the data he and others thirsted for. It was basically an army of people who went to (or watched) ballgames and wrote down the stats that were needed. I attended an organizing meeting he held in a lobby at a SABR meeting around that time, though I never wound up contributing. Anyway the project didn't last very long but it didn't need to. MLB in its wisdom saw where things were headed and gave in.
Project Scoresheet actually improved on the traditional scoresheet. New blood does what new blood does.
Back to the future... with the way technology has advanced, it might not be necessary to replicate all the fancy hardware that MLB has installed in its ballparks, to replicate the numbers we're seeing for pitch speeds and launch angles and exit velocities. A bunch of geeks can bring down such an enterprise, so it's perhaps best to use the technology more indirectly to bring in the money.