Is that not on Krafton for buying Unknown Worlds for $500 million, and then offering an additional $250 million if they achieve particular goals?
If it was unrealistic, then don't buy the company for that much, and provide a contract with those terms.
From Unknown Worlds' perspective, it would have been irresponsible not to take the deal, assuming no other conditions.
That Krafton's CEO got buyer's remorse isn't their problem to deal with. Caveat emptor and all that.
That's the trouble, you see, most people have moved onto multiverse cardigans now.