Given the existence of both the ESRB and CARA systems, I don't find the Common Sense Media Ratings to be filling a particularly large hole in the industry. I also don't appreciate the implication that other rating systems are biased or paid for. The break down by age and what is recommend is interesting but it feels like they draw a lot from somewhat flimsy science.
I do really enjoy the breakdown in ratings though. I think its a useful metric to both warn students and parents about upcoming curriculum material in a way that may help them avoid triggering issues. I know in universities more and more teachers are putting forward trigger warnings to cover similar problems.