The bosses of Bavaria live in the past. They think it's still possible to get top players just because of their brand or cheap. But it doesn't work like that anymore. Even a free player demands a signing bonus simply for the fact that he chooses your club. Even a player who was already in Bayern, Lewandowski, wanted a more solid contract than for a year, and in the end, due to the fact that Bayern did not accept this desire, everything ended in a scandal. The bosses of Bavaria do not understand the reality they are already in. It will cost them dearly.
They have the luxury of getting most of the players they want in the league that's why they still live in the past
The other teams in the Bundesliga are not as rich as Bayern, so they happily take whatever Bayern offers. It's like Bayern has an influence on these clubs. Coupled with the fact that every player in the Bundesliga will want to play for the most successful club in Germany.
Assuming Man City are not a rich club and they have a solid structure under Pep, Bayern could have easily taken Halland from Dortmund if they wanted to, like it happened with Lewandoski.
It's going to be very difficult for any other club to knock Bayern out of the top because Bayern just quietly takes the best players in the other Bundesliga teams if they want to.