Currently, regulations regarding crypto in each country are almost different. You will find real functionality in crypto in countries that legalize crypto as an alternative payment, and you will not find it in countries that do not legalize crypto as a payment alternative. in my own country, crypto is still very rarely used in real life, it is nothing more than an investment tool. So, when you go to some countries, you can only see crypto as an investment tool, and not see its real function. well, it all depends on the regulations of a country. So, when you see that in a country the use of crypto is not optimal as an alternative payment, it is most likely due to regulation.
Regulation is one part of the deal, the interest in that nation is the second part. There won't be a decent regulation in any nation as long as there are not enough attention towards it. There are some nations that show extra love towards crypto like Philippines or El Salvador which are small, but the USA shows big interest to it as well whereas the UK doesn't show the same interest. Doesn't mean they do not care about it, it is just that the hype is not as high as some other nations.
This makes the regulations take longer because it is not an urgent thing. Politicians who see that they could earn some votes if they support crypto regulations will make a law quicker, if there are not enough interest then there are not enough votes to get and that is why it is quite impossible to get politicians to act quicker.