Hi,
today some German speaking media has released that according to Deutsche Bahn (Eurail B.V. shareholder) the Interrail pass is more popular than ever: this year 600,000 tickets have already been sold across Europe. Compared to 2019, the number of tickets sold has almost doubled. The number of Interrail tickets sold in Europe this year has risen to a record of around 600,000. Germany is at the top with 142,000, followed by Switzerland with 94,000 and Great Britain with 63,000.
Here the article of “Tagesschau” (news website of German public broadcaster ARD) in German:
https://www.tagesschau.de/wirtschaft/interrail-tickets-rekord-101.html