I tried once to integrate with software used by pharmacists in Australia (which costs a fortune and looks straight out of the 90's). Even though they have a SQL database with all information about everything, the DB is encrypted and they provide no way to access it. I tried contacting the company to learn how I could integrate with it but they offered no help. It's not in their interest to help upcoming competitors and they claim they cannot provide the encryption key as that's for protecting the customer's privacy, forgetting that the pharmacists already have access to all data through their software. But without a way to automatically extract information from the DB, there's no way to migrate to new software as no pharmacist would want to use new software if it cannot "import" the data they need.

It's clear that the reason there's no competition in the market is that the companies (I think it's literally one company) selling this software want it that way, and legislation is yet to catch up with the way they ensure their monopoloy.