> Lots of criticism of the short export window, but no one knows how many customers they have.

Even if they had only 1 single customer, that's not an excuse to close the service and allow exporting with just a 4 day notice. People and companies have lots of priorities, and now they've been forced to focus on this instead of whatever they were planning on doing. There should be at least 30 more days of service running, with another 30 days with the service offline but data exporting still available.