[talent_deprived]

I've seen at least one place with many more than that in recent years. If you have one microservice "listener" per queue and another for the database processing and persistence (business logic) and another providing an API for one or more frontend UI's related to it then the microservice tally goes up very fast. It's kind of surprising to read so many comments indicating HN readers weren't aware of this.

[herval]

sounds like a massive nightmare

[isbvhodnvemrwvn]

Most are likely limited to some subdomain, with limited communication between domains.

[donutshop]

Massive scale*