The OP (Little Mouse) is hired by the owner of the site to promote their platform. He is working as a middleman here. And it is common thing to see affiliate link under the infographics in a gambling site announcement thread. The owner of the site has said this in that topic
The first screenshot you shared is of our official website. The second screenshot is of the promotional $50 bonus welcome offer exclusive for bitcointalk members.
Registering with the offer link gives to $50 credits using which you can purchase tickets and participate in our Jackpots. Hope this clarifies your doubt.
It means, the owner of the site has created the exclusive referral link for the bitcointalk forum members. You will receive some free balance if you create an account through the referral link of the announcement thread.
Probably it isn't forbidden to use referral link under the infographics/hyperlink in the announcement thread if the OP is owner or hired by the owner of the site. 1miau has made an explanation about this
There are some
exceptions, where reflinks could be tolerated like if you are including it in a very informative reply / description which adds value, a site owner who wants to track traffic coming from Bitcointalk or similar where it's very clear that it's no
ref-spam.
However, spamming with referral link is against the forum rules. But you will find referral link under the infographics in most of the announcement thread in gambling section. Here are some popular and reputable crypto casino with referral link in the announcement thread