Bitcoin is the most popular currency for online betting, most of the gambling sites accepts bitcoin and other major currencies that has a volume.
Projects under ICO wants to run their own project using their coin because they want the investors to benefit.
Bitcoin gambing sites usually are more established as they have big investors and people are more accustom with this kind of gambling sites.
Exactly, bitcoin is popular crypt and all gambling sites easily accept it, even bitcoin make online gambling sites, then why not these sites accept bitcoin. Even we see in this forum, every gambling sites accept bitcoin and also other crypto, we should see here
https://bitcointalk.org/index.php?board=56.0.
