Blockchair's problems have long been resolved.

I'm closing in on another potential problem: this VPS might run out of bandwidth (2TB) before the end of this month. If that happens it will get suspended, and be back online next month. This hosting package doesn't allow adding more bandwidth, and I've paid this server until November 2023, so I'm not switching elsewhere any time soon.

I'm glad to see this data is in high demand though: