Honestly that doesn't seem to be happening too much, in fact bitcoin value surged on announcement the fork was cancelled, perhaps over a few days alts will rise again but it wasn't the huge pump of alts or dump of btc so many expected.
Oh really?
That's not what Im seeing in my alts
lots are up 30 ish % in hours. Imagine when sluggish old btc lets their tx through to exchanges.
I mean this is the first few hours right, most probably don;t even know about it. Then they need to get their btc to exchanges ... things dont happen instantly but then 30 % up in a few hours is considered freaky in any other markets other than crypto.
Again alt holders make these fork seekers pay a good rate don't let them back in so cheap. Then perhaps next time they think more carefully before bailing out to every fork they catch wind of.
Make 10% on your btc from btc based fork alt and lose 50% or more on your real alts. Not so attract a proposition.
Pull you cheap alt sell orders and make them pay full price pre fork annoucement.