It's very true adding all the uncertainties that comes with football recently its very possible that PSG can act very poorly and other teams take advantage of them to getting to the top of the table that was how it happened few seasons back where PSG later struggled getting to win the league title as they lost it that season.
In a football match anything can happen. But if you look at other teams I think there is very little chance of them beating PSG to win the League. One team that was able to beat them was Lille in the 2020-2021 season and if you look at the statistics it's not like PSG performed badly and then lost points. The competition was very competitive until the end of the season and Lille won the League by only 1 point. This means that to beat PSG you need another team that is also able to perform consistently. NICE has shown good performance some time ago but currently they are inconsistent with winning then losing then winning and then losing again.
Not only did Lille Monaco also break PSG's dominance in the 2016/17 season, but that only happened once after that PSG continued to win the League 1 title and only broke Lille in the 2020/21 season. In my opinion, league 1 is not very competitive because this league is always controlled by PSG and there are no other teams that really put a lot of pressure on PSG, even Nice this season is not better than other teams in league 1 who only put pressure at the start of the season when entering the middle their consistency weakens.