I think there are people who don't register site and only just visited anonymously to see what is the site offering but may not get the complete features <...>
That is not the case here. I am registered and I get the same (I was going to upload a pic but
https://www.talkimg.com/ isn't working).
They did post an update earlier today and stompix linked the tweet about their transition to a prediction market.
I agree they shouldn't limit the visibility of their sportsbook knowing how popular sports betting is nowadays.
It's also good to know they now have a sportsbook. I probably would've missed it too if someone hadn't pointed this out and the last time I checked they only offered casino games.
This is the most likely explanation, although I don't see why it has to be incompatible, they could keep sports betting as well.