GOG isnt setting the price, the publisher is. So maybe turn it down a nodge or at least think about it first?

And the problem with the price policy is that steam demand no lower cost on average on other platforms, so that stops developer from selling it for cheaper somewhere else. Except if they put in a bit of extra work and sell it as a different version from the steam one, which is something they evidently don't see as worthwhile.

Which again has the responsibility on the developer/publisher, not GOG.