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The main reason why PSG is always winning their league is because they have more resources to sign any world class player they want but other clubs don't have that resources to sign in world class players, and again other clubs are not dissatisfied about the constant win of PSG, if they are they will not allow PSG to always lift the league title, in English premier League it is very difficult for one particular club to continue lifting the league the reason is because they have clubs that are financially capable of buying world class players and together this players we do their best to make sure that they defeat any club that seems unstoppable, Ligue 1 is not very competitive and is very bad for the league because it won't move people to watch their league I really cannot tell why other clubs are finding it difficult to list that Ligue 1 trophy.
It is not about the abundant resources at PSG's disposal but rather about their resilience which I think the other teams do not have, if you take a good look at the players in the PSG squad you would notice that most of them are not that exposed as much as the players in Real Madrid but the PSG players play with much zeal at the moment, if this traits can be emulated by the other teams in ligue then they might dethrone PSG from the top soon.