IMHO anything with more than 400 million users is very hard to fuck up as a platform. You can fuck up the product in many ways but you will preserve the strong network effects.

Yahoo was also an incompetent operator with almost no solid business criteria or long term strategy. For 15 years or more Yahoo was simply a wannabe Google and never managed to find their business character.

I mean, it’s almost criminal to compare the performance of Microsoft vs Yahoo as operators. They are in different leagues.