I've heard about the recent GameBanana fangame ban and it is affecting other Baldi fangames too that they had to use Itch.io or Gamejolt to make or upload fangames while GameBanana is for mods only.
I assume, since Ultimate is a fangame, it may likely not going to be uploaded to GameBanana once 1.0 releases, due to the fact that GameBanana no longer allows uploading fangames to their page.
I honestly find this change really strange and also unnecessary, because most of the Baldi community who uploads their stuff is usually GameBanana, since it's a very popular website than Itch.io or Gamejolt, so I am honestly dissapointed with this change, but oh well, I guess I understand what they were going for.