No matter what Dortmund must be still in a very good position financially. After Bellingham's sale they have made a big amount of money. This is their priority in the end so I don't think they are still thinking about how they can lose their title chance like that. Yeah it was really unbelievable but they are still able to reach their main goals according to their vision.
As long as they make so much money in sales of their players it wouldn't be important for them whether they are champions or not. I assume the fans think the opposite but they must be also aware of Dortmund's policy already. Otherwise Dortmund can easily build a squad that can be much more competitive for the league title to win.
I think everyone has understood about Dortmund's policy and even now they are still doing this business without fear of whether they can win the title or not. So far Dortmund fans are well aware of Dortmund's decision to sell the player and they continue to support their favorite team even though the final result remains beyond expectations.
Maybe if the fans of other clubs will definitely protest on a large scale if the club owner only continues to think about profits without thinking about the fate of the club to be able to win the league. I think something is definitely wrong and fans should roll up their ranks to occasionally protest against the club's policies or else fans will forever be a tool of business for the benefit of the club's owners.