Everyone hopes to invest in bitcoin, this can be seen from the enthusiasm of the current condition, there is indeed a different treatment of people's investment patterns, compared to big whales or companies, this can affect the value and state of bitcoin.
That's why people choose to invest in bitcoin, because the profits they get are even more promising than investing in other altcoins, but in a broad sense almost everyone wants bitcoin to rise and be stable.
There is also the school of thought that bitcoin going up usually means good things for altcoins as well, which means that if you really work hard enough then you could make money based on bitcoin ups and downs even when you do not have any bitcoin but only hold altcoins, of course it should not be a horrible altcoin, it should be a proper one. There are so many that I dislike, USDT is not even an altcoin for me, XRP is a centralized horrible scam, BCH and BSV were always jokes to me, doge is a worthless and useless coin that got hyped.
However aside from that, if you are holding stuff like eth, bnb, ada, dot, matic, uni, cake and so forth and bitcoin goes up there is a %90+ chance that you are going to profit as well. So maybe not all bitcoin holders want eth to go up, but all eth holders want bitcoin to go up because that helps them as well.