This is what is not liked about the Bundesliga, every time there is a good player from another team, Bayern Munich always targets and buys him. That's why it is difficult for Dortmund to win the Bundesliga because all their players were sold to their rivals. This will also happen to Leverkusen next season, especially now that Leverkusen players are starting to be targeted by European teams and there are even rumors circulating that Xabi Alanso is also being targeted by Bayern Munich to replace Tuchel at the end of the season. So it can be predicted that Leverkusen next season will not be as strong as now. I'm not sure that next season Leverkusen will be able to compete again for the Bundesliga trophy.
Even if it looks annoying but they have control over it because in the end they have the attraction of the Value of being at Bayern as well as stronger financial strength so there is really no reason to reject a proposal from a club like Bayern in the end we just have to continue to accept because this is a normal thing and there is no prohibition in the end for things like this.
Bayern have always made the bundesliga an agricultural league so it is very natural that when there are players who have good potential in other clubs in the bundesliga, they will immediately try to bring in these players in addition to limiting other clubs from developing this is also intended so that the competition for trophies does not experience many changes and Bayern will continue to be the highest club in the bundesliga.