As there was no official announcement (well not one that I can find anyway) it is difficult to tell. However, it seems that it started around the end of March/beginning of April.
You are right though, the site has more Swedish members than any other nationality by far yet new signups from Sweden are banned. Which seems a bit odd. There are many users from Greece too.
Current users from banned countries are ok., it's just new signups that are banned.
Seems this has had a major effect on their user numbers which have dropped approx 5,000 in the last month or so.
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