Didn't all this start with Linus getting into a spat with the bitkeeper dev involving some sort of punitive measure as a response to somebody making a reverse-engineered FOSS client? I don't remember the details and I'm sure I have at least half of them wrong, but that's easily one of the most disastrous decisions in the history of the software-business right up there with valve turning down minecraft and EA refusing to make sports games for the SEGA dreamcast (that last one isn't as well known but it led to SEGA launching the 2k sports brand to which outlasted the dreamcast and eventually got sold to a different company but otherwise still exists today and is still kicking EA's ass on basketball games).
And while NBA 2k destroyed NBA Live it took until 2009 for that to start happening (long after Sega ownership), mainly down to sliding standards in EA’s NBA Live titles and eventually some disastrous EA launches.
Also the last football game in the series, ESPN NFL 2k5 (actually released in 2004 a few months before they sold the studio to Take-Two) was seen as the primary reason why EA payed off the NFL to stop selling licenses to their competitors; so it's indisputable that the 2k-sports brand had a negative impact on EA's bottom line while it was still a SEGA subsidiary.