Received the email yesterday, account expired today. Couldn't get the subscription page to load with the VPN set to Argentina, India or Turkey. Just loaded a blank screen for me. Youtube homepage worked fine, clicked on youtube premium and it's a blank page. Even on a browser that had never been logged into google or youtube (edge) in incognito mode...
If you can get to the subscription page, apparently Mastercards still work, it's just Visa cards that are just being blocked.
Brazil worked, but for a Family account that was about £5.50. Also worked in Colombia for £4.70 or so. £7 in Romania. £8 in Costa Rica.
So I've temporally moved to The Philippines. £3.40 for a family account there.