Public transportation in Paris is already somewhat overcrowded, especially during rush hours on several lines(cannot get it even by letting several subways pass

Public transportation in Paris is already somewhat overcrowded, especially during rush hours on several lines(cannot get it even by letting several subways pass). It's mandatory that employers reimbourse 50% of the price, and overall it's already really cheap. All in all, it's a bit pointless and more a stunt. (it's free as well for a couple of tiers if I remember well)