Every seasons Bundesliga teams will always be attempts to strengthen their squad by buying new players and the latest teams who very agressive in transfer window is Dortmund that so far they get 8 players and i think this is prove that Dortmund serious want to compete with Bayern Munich for race title but indeed the most problem is while Bayern able to get star players but other teams only able to buy mediocre players this because financial strength for Bayern is very strong so that's why they can get the players they want and if these gap of financial strength cannot be reduced then it is difficult to other teams compete with Bayern
There are other teams in the Bundesliga that would have enough money to make bigger transfers, but then they would have to save money... on stadium expansion, which can mean fewer fans in the stadion over the years. Or in the youthacademy, which means that the young talent is not so strong. The TV funds are high, for example Dortmund 80 million euros, or Leverkusen 75 million euros, RB Leibzig with 73 million euros or Eintracht Frankfurt 67 million euros. You can buy star players with that money, but it would be missing over the years in other projects.
Not to mention Bayern Munich getting free money every season by winning the league title. I say free money because I don’t think there is any really serious competition in the league for Bayern Munich. And that’s why the other clubs find it really difficult to progress and also compete against Bayern Munich. They can only do one thing, either improve the facilities or improve the squad. And it is a very challenging decision to make. And Bayern Munich does not have to worry about improving the squad because they already have a squad that really consists of good players.