Enshittification is what happens when companies have to really start making money. They often lose money in the race to build up a strong userbase. Once they have that, they start ruining the experience by showing too many ads and/or charging for access. Facebook isn’t going to invest in federation if it doesn’t have a very solid plan, devised by a huge team of well-paid professionals, to protect and grow its profit margin. Anything they touch will enshittify eventually.