Two years after it’s release, Teenage Mutant Ninja Turtles: The Cowabunga Collection will be getting delisted on Steam in Japan on March 29th.
There is no word yet on other platforms but it is likely to occur on those as well.
It remains to be seen how long until the collection is delisted outside of Japan.
This is what happens when you buy all digital games. You don’t own anything and it can and will be taken away from you at any time.