I can afford enterprise-grade drives. It is rather that I have little to no clue about the reliability and failure-rates of different manufacturers/models.

And how different are these from consumer-grade ones? Is it cheaper to buy expensive drives once instead of multiple cheap ones one after another or do the quality differences not matter that much at all?

There is Mailcow. But simple is relative I guess cause you still gotta configure a lot around it to not end up on every spamlist out there

I get what you mean. I just cant wrap my head around how many people buy windows without even realizing it and think they get it for free or some stuff

I mean you pay for Windows on preinstalled computers, too. There are Laptops sold without OS and they are cheaper than the same model with windows installed.