It is not possible to directly indicate that, this team is responsible for the manipulation. But it seems to me that large-scale investors manipulate the markets in many cases to take control of the market.
There are several types of wallet for Neo like aphelion wallet, neo tracker,web wallets and other exchange wallets. And you can use any of these. In that case, you have to take precautions. If you are careful about using any wallet you should will be safe.
I also agree with you that there should be some rules for the new coins to come in the market cap. The new coins also serve new unique purpose and they must have actual use otherwise what is the need of them there are already plenty with no works. If its not possible then everyone should work on the development of the existing.
I think it will improve this technology two steps advanced. In this modern time AI technology is must needed in sphare of life. This DELTA-A Blockchain protocol, i think will be able to improve enough.