As I said. If the cost is the only thing stopping Taleworlds from allowing it, Taleworlds is literally broke. Like about to go bankrupt and the game isnt getting finished broke.
Unless they are embezzling funds or something else wild like that, we know this simply isnt true, because Bannerlord is one of the best selling games in the last year. Granted, its possible the long development had them operating in the black for quite awhile, but I seriously doubt they are anywhere close to in danger of going under.
This is also completely glossing over the issue that numerous clans and communities would be more than willing to simply pay the cost of their server for Taleworlds. It makes no difference to GK or IG if they are paying a 3rd party to host or Taleworlds directly. Its the same money for the same purpose as long as Taleworlds is charging equivalent to what a 3rd party like Oasis Hosting or Marksmods would.