> There's companies out there that value output at what you're worth
In any auction the selling price is not the value of the item to the winning bidder, it's the second highest bid plus $1. If you move to a LCOL area the competing offers are all going to be garbage unless you can find a second high-paying company to extend you a remote offer (which may or may not happen, depending on how widespread remote work becomes). Facebook has no reason to unilaterally raise their bids unless you can secure good competing offers as leverage.
In any auction the selling price is not the value of the item to the winning bidder, it's the second highest bid plus $1. If you move to a LCOL area the competing offers are all going to be garbage unless you can find a second high-paying company to extend you a remote offer (which may or may not happen, depending on how widespread remote work becomes). Facebook has no reason to unilaterally raise their bids unless you can secure good competing offers as leverage.