We don't really understand what happened. Bitcoin suddenly grew but the alts did not, and even decreased. I think the reason is that sharks are trying to buy more bitcoins, so this happened. The alts have suffered a lot from the sell-offs of high money investors.
How about the more logical reason that all these alts were pumped too high and too fast during socalled alt season and ICO frenzy?
How could most tokens that came out from nowhere and were not even used by anyone be valued so highly?
Because they had nothing more than pumps,,, plain and simple, that is all.
Some people are trying to make it seem as if it is impossible to know what it is happening and that is not true, years ago the hype for cryptocurrencies not named bitcoin was huge and since many of those developers did not had the skill to develop their own coins independently they depended on ethereum but since then things have changed, no one believes that any altcoin has any chance of surpassing bitcoin and the most promising projects are releasing their own blockchains so this has the effect of reducing the demand of ethereum.