No, he wasn’t making a free version of Crossover, but it did the same thing as Crossover. They both use free software made by WINE. The Whisky dev was not stealing from Crossover. However, Crossover gives some of its proceeds to the WINE community, so the Whisky developer felt that users using Whisky were indirectly cheating the WINE community by getting a free ride. Note that Proton and WINE are free. Crossover is the outlier being paid, but Crossover also gives back.

There are no assholes in this situation whatsoever. Not the Whisky dev for giving us a free alternative and not the Whisky users not paying for Crossover. Not even Crossover since they contribute to WINE. If there are any assholes, it’s developers who make games for Switch but not Mac (since they’re both ARM64 platforms; obviously not counting first-party Nintendo developers), people who pirated Crossover, and developers not developing at all for ARM64. But that’s a stretch and I’m not after any of those people, I’m just saying, if someone has to be an asshole, that’s where I’d look, not at Whisky/its dev/its users, and not at Crossover/its dev/its users.