Yeah, I find the constant focus on ~100% uptime a bit crazy.

I used to work for one of Australia's largest bookmakers and we would regularly switch off the datacenter overnight to do some work on the servers. It didn't seem to impact the growth of that business one bit. There were times of course where uptime equalled cash, it just wasn't all the time.

For my personal hobby projects, I would actually rather have downtime than a surprise bill if something gets popular.