Technically they're harder to manage and often come at a high technical cost that you should never attempt to pay if you don't have to, but it's an effective way of managing the often extreme coordination costs that exist in large, dysfunctional companies that simply don't exist elsewhere.
I used to rail against microservices for years (working in startups) until I finally worked at a large dysfunctional corporation trying to run a lot of complex processes that spanned a lot of tightly coupled departments and then I started to see how they made sense.
It also gave me an appreciation of the problems Bezos recognized when he tried to decouple the organizational fiefdoms under his control.