I posted for a vendor zone back in Sept 2018, I think, certainly sometime around then. I chased it up a couple of times then, more recently late last year and each time nothing at all. Not an electronic sausage.
Should we abandon vendor zones and just use pool.ntp.org? (At present we’re using rhel.pool.ntp.org which isn’t right for Oracle Linux.). I have no idea what the suggested donation might be, no one got back to me with any suggestions at all, but I can’t imagine it would be much of an obstacle.