Aggregator sites like coinmarketcap and livecoinwatch often show trends of greatest gainers/losers of the day/week/month/year. However, coins with almost dead marketcaps are prone to manipulation.
Why don't these sites remove such coins?
There are a lot of garbage on the market right now. Give an example, which coins do you think should be removed? If you did not know, then only those tokens can be scrolled through CMC , the daily trading volume of which is more than 5k $
Just scroll past > 1000 and see some coins with one or two extremely low-cap exchanges, which were quite popular at their time. Their ANNs haven't had activity for years, but once in a while their graphs have spikes showing some pump and dumps by unknown forces. Definitely some people got burned there.
The least they could do is have a page for these types of coins, and remove them from the normal trending and other stats pages.