You jest, but the FTC is trying to appeal (undo) the merger in court, and this makes their case a lot stronger: https://www.reuters.com/markets/deals/us-ftc-tries-again-stop-microsofts-already-closed-deal-activision-2023-12-06/
For a 68,000,000,000$ deal, even if this helps the FTC by 1%, that's a huge risk