It's called MLB Advanced Media
Back around 2017 when Disney was planning to launch a streaming service they hired them to built the infrastructure, but Disney didn't want to just license the tech they wanted to own it. So Disney decided to partner with them instead of hiring them buying their way into the intellectual property, in a series of investments Disney paid a total of $2.58 billion just for the tech that was going to be used for this service. In addition the company that ran the Disney+ service was 33% owned by MLBAM.
Then that first year when Disney+ launched it was a huge hit with over 100 million paying subscribers. Disney went crazy for the streaming business and wanted the MLB out so they could own it wholly. So they paid MLB a billion more to buy them out of that company. A few years later Disney+ tanked and the streaming business got saturated and went down. MLB got out just at the right time. That's been just one of the side businesses from this division.
MLBAM has been huge for MLB.