I think zalmoxes' point was that they may have found out through direct contact from the founders, or a customer-only email 2 weeks ago - rather than just by loading up the homepage today.
Well, no, it's literally not. It's actually a reasonably long lead time for “going out of business”, which basically no one ever announces before essentially all hope of finding a way to keep the business running is exhausted, which intrinsically means there is little runway left.
Yep, it literally is last minute for a platform product used by others during a time of the year when the developers responsible for finding/building a replacement would otherwise have gone on vacation.
If this were a tangible product, a week notice would be fine since it gives customers time to stock up.