I'd love to see how many businesses saying they'll move actually do, and how many are just run by huge remain supporters throwing their toys out of the pram because they've just been told they can't have their favourite flavour of ice cream.
You're assuming they were on the Remain side for anything other than selfish business-related reasons. If it makes business sense to relocate then why wouldn't they? No business is going to deliberately damage their economic prospects just to make a point to people that don't trust them anyway.