Well the moving party has to prove their allegations, aka Ubisoft moving to sue you means they have to prove everything they say. Since their stated public position is that they are sole owner at all times irregardless of circumstances, they would be legally barred (estoppel) from arguing that any one could hurt their possessory interest (rights and share of ownership). They essentially would have to shift the argument over, similar to a theft of service argument (not paying a train fare is a crime but you didn’t steal a train or turnstile). The question then becomes what service does ubisoft provide? Online servers that do content distribution seem to be the only thing. If you got it on the high seas you never hit their network, so all I see left with my hypothetical napkin math is all that random network traffic ubisoft games seem to always have (even offline).

There’s a number of cracked games now with online play enabled, you just need to make a burner Steam (etc) account to use it so your main one with purchases doesn’t get nuked if they catch on.