This is from the Coindesk article,
The 2017 bull market is remembered as a phenomenon driven by enthusiasm for initial coin offerings (ICOs) on Ethereum. However, by the time the frenzy reached its fever pitch, ether (ETH) had largely completed its run. At the midpoint of 2017 Q4, bitcoin returns were 23.9%; ether returns were 6.9%. It was bitcoin’s Q4 catch-up run that fed the bulls.
Who ever wrote that must have made a fortune from the ICOs.
.... Bitcoin bull run is from itself and Ethereum does not contribute to bitcoin bull run.
A case can be made this time since the introduction of wrapped btc which allows holders to lend and earn something from their bitcoin holdings [DeFi]. I just don't know if the amount is significant enough to contribute to the current btc run. Maybe someone can pull up the numbers.