-1) promotes ecosystem monoculture -2) centralizes point of systemic failure -3) a downside to the "network effects" benefit is that it is becoming a "social

-1) promotes ecosystem monoculture -2) centralizes point of systemic failure -3) a downside to the "network effects" benefit is that it is becoming a "social coding" platform, with all the toxic effects and perverse incentives endemic to social media -4) Owned and controlled by a company which, while acting better in recent years (and I do believe the people involved are sincere!), still has not even apologized for their truly vicious attacks on free/libre and open source software in years past, and no indication that they've atoned for embrace-extend-extinguish.