I'm surprised databricks (effectively) is willing to shutter a database service with 1 months notice.

What does that say about their own products? What if you integrate their products and are locked to their platform without any easy migration options?

If they lose interest on one of their own services, you very well may have 1 month to move, and 2 months to have a chance at keeping your data.

Seriously. Well, I guess their customer roster isn't all that impressive. Sounds like they're willing to burn them.

The problem is the signal it sends to Databricks' other customers about how they will be treated in future.

Databricks is very much like Microsoft or Oracle - it is not sold by technical merit but by sales slides for CTOs. It is unfortunate but this will not impact their bottom line at all, because technical people already overwhelmingly don't want Databricks.