That feels weird to me as well. I get that they need to trial it, but United States, France, Germany and the United Kingdom isn't really the countries I'd priorities for a free VPN.
I understand that a number of people in both the US and the UK is struggling right now and may not be able to affort a VPN, but their primary need is to avoid age restriction, while a large number countries are censoring the internet for political reasons. That latter seems more important to address.
Over the past year, Pornhub had to make the difficult decision to block access to users in the following American states due to Age Verification laws: