It’s easier to buy known brands, fix them, and get users back, than it is to try and get users to download a newly created series.
People also thought Microsoft was stupid for buying Mojang for 2.5 BILLION, because “everyone who already wants the game already bought the game”.
Ignoring the fact that entire new generations have been born and become obsessed with it, play on bedrock with the market place, and buy all of the Minecraft merch. Also all of the other games they’ve launched with the Minecraft branding since.