The 至高赔率1.9999 is a Chinese language SEO scam that involves creating thousands of fake websites which has legitimate content beneath some sort of casino/betting scam overlay.

The websites look like this -

But the HTML code beneath is legitimate websites. For example the scam creators will load all of the resources and HTML of a large branded website but then hide all of the elements using JavaScript and show this content instead. This breaks our indexing methodology and I suspect does the same for many other web technology services and data providers.

Google as of September 2022 has indexed 73,000 websites with this scam content so far.