You may be banned from paying in bitcoin and you simply will not be able to spend your bitcoins anywhere, or it will be illegal.
That was happening a few years ago when so many countries have already declared to ban bitcoin and crypto but with the goes of time everything have already changed right now and you must see the fact more countries legalize bitcoin. The only way to control crypto through the exchange site.
Now the governments of many major countries are thinking differently about the crypto market and surely one day we can live with Bitcoin because this coin will definitely be used for payment soon. However, it is still too early to do this because many countries see crypto as a threat and will find ways to prevent people from participating, so this will be a big obstacle.