That must be nice to have accumulated a large amount of capital exclusively for gambling.
They have wagered it, and talking about 100 BTC or 2k BTC, I think it totally depends on the current price of Bitcoin? If not, the wagers will be different at different prices each time they were played.
But to reach 100 or 2,000 BTC wagered, they must be having larger betting amounts, and to do that, must also have a much larger amount of capital than plebs like us.
Not really a "must" to have a lot of money to reach those levels. Sure you still need a good amount of money, but I have seen people do x2000 which means 1 btc could be a good enough level.
I am not saying that's how you can do it, maybe you will fail and not be able to do it, but for 2000 btc wagered, that doesn't require 2000 btc as well, it requires maximum of 10 btc and that's still a lot but that's about 160k dollars lost, we have seen people losing hundreds and hundreds of bitcoins in the crypto world even when bitcoin was a lot. Just last year when it was high I saw someone losing 300 btc, so it is not really a shocking result to me, it's normal in the crypto world.