These exist, according to https://1x2fixedmatches.com/
– “dark web” = any website that is not indexed by Google or other search engines
– “dark web marketplaces” = websites that offer illicit products and services on the dark web
Some dark net URLs offer you to buy fixed match packs, where setup football and other game match odds are given using insider information. These websites do not require any personal information or payment, and can be found on the dark web.