Are you sure TikTok allows gambling or certain gambling to be promoted? I watch a couple streamers who have put videos of their wins on TikTok and not so long after found their accounts banned. I'm not sure if they do not allow bitcoin gambling, casino gambling, slots, or what but the only content from these streamers are gambling content.
In general, direct advertising of gambling is prohibited on TikTok. Therefore, marketers use other methods. For example, they place promo codes and the logo of bookmakers, casinos, etc. on the video. These videos may absolutely not relate to gambling. Why are such ads not banned? Because the TikTok algorithms have not yet learned to recognize that there is a gambling advertisement on the video.
For example, a promo code from 1xbet or casino is posted on some funny video. In general, this is just a video about a funny situation not related to gambling. There are people on the video, the project logo, some text, etc. For TikTok, this is just a viral video, the algorithms do not see direct advertising, because the video is not about gambling.
Such a video can be banned, but not immediately. It can be displayed for a week, a month, 2, 3, etc., until users complain about it. In this case, the video will be checked by a bot that does not yet know how to recognize such advertising. And this video will continue to be shown until it is checked by a person. Up to this point, the video can gain thousands or millions of views. And not necessarily everyone who watched the video will go and use the promo code, however, such advertising will bring some traffic.