I did some research about why rayman isnt avalible in russian steam store.
The publisher is ND company. The emploee on their forum answered the reason is ubisoft, not ND.
Why ubisoft?

Seriously, it's not a problem to find license digital version, but top 10 results in google search would redirect you to cracked version The whole thing: to sell the game though any well-known digital distribution platform(steam or origin) will result in more sales.You wont have problems like "where is this god**** version to enter the key".
There's no choice for us: to play comfortably within your digital game library or just game copy without a link to any services . I'm really dissapointed by such publisher's attitude.