Honestly, I think Ghosts of Saltmarsh is more in like with Tales of the Yawning Portal and Candlekeep Mysteries (as an anthology of adventures that don't cleave closely to the various seasons of AL). Maybe Curse of Strahd was a first attempt at that, and they didn't know what to do with it with AL so just made a Domain of Dread connection at the Moonsea. Even with AL Season 6, they tried to make a season around TotYP but ultimately all they did was make a couple bridge adventures to the various adventures in the anthology, which worked strangely because they would follow up on a Greyhawk giants adventure but now the epilogue/sequel to that adventure is in the Anauroch for some reason? Clearly wasn't thought through carefully and before the time of Ghosts of Saltmarsh, they had thrown out the idea of having a second AL season per year, so GoSM got to be sort of stand-alone without AL tie-in (save for the one WotC-published adventure on the DM's Guild that ties in but doesn't exist as part of any AL season). Candlekeep Mysteries plays the same into AL as GoSM, so I imagine they'll keep churning out non-AL anthology books every other year in the spring, while the off-years will get something else instead…