This proves that PSG has everything to monopolize the League. They have money and can take any player by offering a very large contract. This will certainly make it difficult for other teams to find the players they need to beat PSG. If Mbappe officially leaves next season I think other teams still have no chance of beating PSG's dominance in the league. Unless other players can find talented players like hidden gems.
Just keep in mind that high spending doesn't necessarily mean quality players, Chelsea is a good example of this, maybe Manchester United if you pick some players who are underperforming or a flop based on their transfer price. Obviously, I don't expect a massive recruitment issue from PSG in the near future but just because you have money doesn't mean you'll always monopolize the league. AFAIK, when Monaco wins the league they don't outspend PSG by a massive amount of money either, don't they? Finding a talented kid might work for one or two seasons until PSG tried to buy them too.
Well, especially if you see that the hosts only played with 10 players since the 60th minute, it is clear here how weak Marseille was in taking advantage of their advantage. I think it's only fitting that after this match Gattuso was fired by Marseille because in circumstances like this they still couldn't win and instead conceded in the last minute by Brest.
The stats suggest that Brest is more dangerous and has more goalscoring opportunities compared to Marseille[1]. Their xG is also quite low, with some individual errors being their weakness on that match according to this data. So maybe the tactics are not working correctly, hence why do players make mistakes and have low morale? But well, they just sacked Gattuso anyway so it looks like the owner made up their mind already. 6 months is really short to make any changes though. CMIIW.
[1]
https://www.whoscored.com/Matches/1741158/MatchReport/France-Ligue-1-2023-2024-Brest-Marseille