You should not only read the text, but also understand it before you answer. I was never part of this group. But after a pump, prices fall below pre-pump levels, and you, the obvious layman, should understand that. Furthermore, it doesn't say that I've made a personal loss (I haven't either.), but that I'm organizing the lawsuit. I also wonder how you know how much I work. But to reassure you, I don't have to work anymore thanks to cryptocurrencies.
For not deleting the pump and dump groups?
Not saying that it's legal. There may have many victims but if they joined the group, they are classified as willing victims. They know the risk but they are willing to bet to make money if there are few who are just right there to invest for long term, they are really lost somewhere in the desert.
If you can provide pieces of evidence where you can link the accounts, it may just be sensible. Many would have done this long before you, especially the victims who lost entire savings or those who actually borrowed money in order to invest.