The dominance of PSG in this league continually remain unchallenged and they have indeed reduced the competitiveness of the league because some how people already know how far other teams can go in this regards PSG is always considered the winners not minding how badly they say it believe they will still end up winning.
Except for the one they lost a few seasons back it would have been on record that PSG maintained the Ligue 1 title for almost a decade without any team coming to contend them or challenge them to the point they couldn't get the league trophy, their games across France is such that other teams are yet to get to their level both in the squads depth and the team strength and form, they reamain the best and this is greatly Influenced by their financial strength which is much more than that of others as they are the richest amongst all others in France.
Yes, no one has matched PSG's dominance in League 1 and they have won many trophies in the domestic league and because they always dominate. League 1 is called an uncompetitive league because the competition in League 1 looks monotonous because no club has been able to match the quality of performance PSG has been around for almost a decade now and to be honest, looking at a league like this makes us bored and the interest of people who enjoy the league can easily guess if in the end PSG will definitely win the league title again and again.
There are only 2 clubs that have been able to break PSG's dominance for almost a decade but that is not enough to prove that PSG really lost because in fact PSG was still runner up when the 2 clubs won the title so it could be said that for many years PSG has always been the biggest competitor. strong in league 1 in winning the title, if there are other clubs who dare to buy good players and can beat PSG, it could be that these clubs will replace PSG's role and make the league competition competitive.