In a way, when we look at MaxOriginals, the only major projects atleast for the foreseeable future, are that of Tokyo Vice and Gossip Girl. And the former had to pause work due to the pandemic screwing things.
I think the problem, as
@Nick deducts, is not only that of the lack of worthwhile content to keep viewers interested in the service, but also that of the toll the pandemic has taken production studios.
It still baffles me that they didn't have a DC or Potter MaxOriginal series at launch. Even with things as they are with either, they needed something that'd cater to everyone in the same way as Mando did.
I'd also argue a small bit comes down to the mismanagement of marketing, but sleep is getting to me.