Has any thief just stolen and shouted : "I'm a thief, catch me, catch me" ? Or is there any criminal who kills someone and then admits to being the murderer and publicly announces it to everyone ? 
It is true that we do not have any concrete evidence of market manipulation but that does not mean that the market is not manipulated . Even the stock market with a capitalization of over $100 trillion has been involved in multiple market manipulation scandals , let alone a small market like cryptocurrency .
You got the right point. a market manipulator will never admits about his/her cheating, but it's not rocket science to understand that market is looks manipulated or not, it's very simple calculation, in a project of course a significant amount of tokens holders from team or big investors, so they have power to manipulate in the market if they just go to sell their all tokens, it's called manipulation, it's absolutely possible, don't need to see other evidence. It is true that we do not have any concrete evidence of market manipulation but that does not mean that the market is not manipulated . Even the stock market with a capitalization of over $100 trillion has been involved in multiple market manipulation scandals , let alone a small market like cryptocurrency .
Whales are now having good control, and they are doing their tricks which are helping them for increasing their assets and small investors and newbies are losing their hard-earned money just because of these silly tricks which are happening around, but they are not able to understand recently we are having some good movements in few meme coins, but mostly peoples are under trap so they were not able to check and having loses.