Double that for companies that were loud about their cloud usage, usually that came with some usage discounts on the side- on-prem does not, and it also looks bad to pivot anyway; so why be loud?
Why does it look bad? It is perfectly reasonable that at the time of the switch to the cloud, that it made good business sense. It is also perfectly reasonable that after some time that the landscapes have changed, and it is now good business sense to leave the cloud. If at the time of the switch to the cloud the pricing was cheap, then sure, but we all know that prices are not written in stone and will pretty much always increase. At some point, those increases become untenable. It's the nature of tech. We used to use thin clients connected to a server, then went to dedicated workstations, and currently we're back to connections to servers.