Some of it is Conway's Law, much though seems purely "cargo cult engineering" or "FAANG cosplay".
Less-competent devs and CTOs hear that Amazon & Google use it, then decide their 12-person team needs to rewrite their product as 5 separate services. I have encountered companies with 50 services where they needed 5, spending 60% of their dev velocity on overhead.
If you're contemplating microservices & haven't already nailed your business transaction boundaries, reliability mechanisms, idempotence, deployment management/ versioning, observability, testability and the operational discipline to run distributed systems you should just stop -- you have no freaking clue and you're going the wrong way.
Less-competent devs and CTOs hear that Amazon & Google use it, then decide their 12-person team needs to rewrite their product as 5 separate services. I have encountered companies with 50 services where they needed 5, spending 60% of their dev velocity on overhead.
If you're contemplating microservices & haven't already nailed your business transaction boundaries, reliability mechanisms, idempotence, deployment management/ versioning, observability, testability and the operational discipline to run distributed systems you should just stop -- you have no freaking clue and you're going the wrong way.