Weird. I always assumed everyone had at least heard of it. It's far more of a classic series than Factorio. I'm not into the newer titles but i've played most of the older ones, starting all the way back in 1998 with this gem that still holds up for me today:

Although the easiest one for a newcomer to get into is probably 1404.

Anno was one of the classic city building/economy management games everyone was playing in Germany, along with the "Settlers" ("Die Siedler") series. (There was also the Tropico series but i never got into that one.)

It's funny how you can play these games for years as a child and only decades later realize that, problematic colonialism aside, what you were doing all along is designing planned economies. In hindsight, it is no wonder i became a communist, lol.