1.) Wavecrest assumes absolutely no exchange rate risk as they don't deal with the BTC, a company like Xapo does
2.) Xapo make a very big margin on the bitcoin sale
3.) The companies that perform the sale at topup time rather than purchase time work out how many GBPs you get after they've sold your BTC, so they assume no risk at all, and the companies like Xapo that perform the sale at purchase time structure their operations to minimise the risk of losing money, and they're aware of the risk, and they're far from the first company in the history of the world whose operations require them to adequately manage risk.
1.) Wavecrest assumes absolutely no exchange rate risk as they don't deal with the BTC, a company like Xapo does
2.) Xapo make a very big margin on the bitcoin sale
3.) The companies that perform the sale at topup time rather than purchase time work out how many GBPs you get after they've sold your BTC, so they assume no risk at all, and the companies like Xapo that perform the sale at purchase time structure their operations to minimise the risk of losing money, and they're aware of the risk, and they're far from the first company in the history of the world whose operations require them to adequately manage risk.