The question is why do some people generalize all Altcoins as bad? considering there are over 3000 of them out there. One would not have the time to go through each project one by one. to analyze the project. team etc everything behind each crypto project.
I guess you have answered your question in a way. Generalization does not mean definitely that every entity fits that description but my little knowledge of statistics we can make a conclusion by just studying a sample of the population. That does not mean every entity fits our description but it's likely that most of them are. hence most altcions turn out to be worthless after raising of funds.