Absolutely no. Polkadot reached the 7th position because of its market performance and stability, no illegal activities at all. If you will follow polkadot project and team, you will notice the credibility and efficiency of the project plans. In fact, polkadot in expected to increase more its market value for the next few months based on what I read in telegram channel.
Quite right, as many people here write. But another and most important thing is that DOT offers a new tokenomics that seriously limits scam projects. Now for scam projects there will be no road to DOT