It's like if someone is killing a lady in the street and you say "I don't make any $ from it so I won't call the police"
Coinmarketcap cares about these types of altcoins but as you can guess they can't monitor all coins daily and without people reporting it can take a while before the coin is flagged.
I shared with them my suspicions regarding possible data manipulation, gave them the name of exchange and coin.
Now, what evidence do they want me to collect? Take a screen recording and send it to them? And then what? They will have to double check it anyway, so there is no point for me of sending them any "evidence".