Every cryptocurrency is pegged to bitcoin. If for example, 1 coin is equal to 100 sats, then the value of bitcoin in usd increases, that 100 sats would be worth more now.
Agree, but sometimes here is some weird things.
Like look: bitcoin goes up - altcoins goes up, and then - it starts to flat - but altcoins dont, they go down. Dont know why, but it exists definitely