To be totally fair, EA doesn't do this stuff out of malice. EA's acquisitions fail because their executives are miserably incompetent.
Basically this is what happens: some manager plays a game made by a beloved studio or minor competitor, and they get all starry-eyed about the amazing things the studio could do with some extra money. EA buys them, and it works fine for a little while. Then, some executive realizes that their subsidiary's games are really profitable, so they order the subsidiary to expand and work on more games. Other executives order rolling staffing changes based on whatever project sounds popular at the time. Quality slips as team members are overworked and no longer emotionally invested. Meanwhile the key staff, usually the founders, are used to dealing with small teams and small budgets. They allow themselves to be divided across too many projects to be effective managers. No longer constrained by small budgets, their ambitions explode and runaway projects become a major problem. EA's managers try to put the studio back on track by setting firm deadlines, but due to an institutional lack of effective project management or engineering experience, their deadlines are physically impossible. EA publishes a steaming turd in time for Christmas, decides the unit has lost its magic, and shuts it down. EA's accountants use the ordinary/capital losses to offset their gains from sports, and all of the executives take home a fat bonus.