A team got some ways to make money and even teams like Dortmund earn money by selling talents they have like Bellingham and previously with Haaland they lose many great talents and because of that they are not in a situation to compare them with Bayern Munich but that's how they can earn money and that's their business for years.
Among them are Bellingham, Mahmoud Dahoud and several other players who will leave Dortmund this season, either being sold or leaving on a free transfer. But what's interesting is that Bellingham departure to Real Madrid happened recently and of course Dortmund made a sizable profit on the sale of Bellingham. The player selling business has indeed been carried out by dortmund in every season because it is an easy way for them to get big profits. From this huge advantage Dortmund can buy many other players from other leagues at a low price and that is what they do in producing talented players every season. But with what dortmund is doing, of course, it makes them not too strong in every season because they have to lose several important players in every season.