It should be allowed. The Bybit service is only prohibited from being accessed by US citizens; since you are not from there, the card should be used as long as the payment you want to make with it allows a Visa card, or unless Bybit itself restricts places where the card can be used to make a payment.
Seems you are repeating his statement and contradicting it at the same time except you probably meant UK which I barely have any idea if they have restrictions of such in their country. Well to start with I think op should read the terms of service of the card to be clear on these information.
I misunderstood him, thinking he was from overseas and now living in the US, which was where my statement was coming from.
As for the UK, last time I checked, Bybit still operates there unless there is a change in their policy, which I'm not aware of, but I doubt it.
Edit:
Just checked and Bybit I also have UK as part of the restricted countries:
(Section 3.4), Bybit lists 16 excluded jurisdictions/regions (not all are sovereign countries), including the United States, Chinese Mainland, Hong Kong, UK, France, Dubai, and several sanctioned territories.
https://www.bybit.com/en/legal/terms-of-service/terms-of-serviceThe op just have to test run it to know if it’s allowed or not, as I can’t even find it on Bybit card terms.