I don't believe they don't know what a forum is and I don't think the problem is with the forum and cryptocurrencies, but rather that the ban is the result of very high gambling activity on the forum. However, as you already wrote, the forum can still be accessed with a VPN or Tor, and if everyone used one of those (and they should), this topic wouldn't even exist.
It honestly surprises me how few people on this forum have a sense of privacy as if we were on a forum for growing flowers and ornamental plants.
All we can do is speculate things.
I don't know what gambling activity did you mean. All I see is some gambling threads and people are discussing about gambling. We rarely have gambling events sponsored by the casinos where people participate. My best guess is, they have seen the scam accusation board where players create scam accusations against the casinos. However, the government might think that this forum is involved in scam, or the scam happens in this forum, which is why they might ban access to this forum. This is bullshit actually. You cannot imagine how retard people works in government.