I also noticed this whilst adding some new GCB additions (plexian casino is intriguing) to my personal directory last night, then got hyper fixated and spent the night updating all my entries for curacao to their new licences if they had any. I had previously had them all down as "Curacao" with no differentiation. The vast majority as you say have swapped straight to GCB. A minority amount have swapped to Anjouan.
Whilst I don't have every casino in my list I have about 800 so a good amount are there.
From what I've seen anybody still operating with a 5536/JAZ licence will have it expire at the end of January 2025, some examples below, although techoptions ones may have expired completely.
365/JAZ licences have already ceased a while ago, here are the sites I have that seem to have not replaced them yet, alphabook seems to be winding down as a few weeks ago i couldn't deposit (0 limit) and now you cannot access the website.
Out of all the 8048/JAZ licences on my list. Mountberg will probably sort it out eventually, wonder if they will follow Starscream to kahnawake since they are somewhat related. Kahuna/Kaulana Casino ceased and joined Tahiti Casino (also KGC) so maybe. Stake will no doubt get round to it eventually. The others are quite small and betti has been ridiculed on this forum previously.
I don't really have an image for 1668/JAZ as I don't have any sites from that master licence on my list. Have this instead:
As for Anjouan, not too many sites (from my list) switched over from 8048 but Legend Affiliates / Entertainment Software must have changed to it after their 365/JAZ ceased.
I have 322 sites that have Active or pending/in progress licences with GCB. Not going to post that image, but if its of any use to the CM staff let me know and I'll pass it on, might be useful for updating all the reviews of 8048/JAZ sites that swapped over.