you value Steam's honesty

Both are multi-millionaire if not billionaire companies. There's no way to attribute virtues like "honesty" to corporate entities.

But GOG is a much worse store than Steam, lacking features Steam had a decade ago and, most importantly, being loudly indifferent to how the games work on platforms other than Windows. Any gaming thread gets flooded by GOG fans talking about how we should support them anyway, because they're great and anti-DRM... Except I'm telling you they aren't, if their own games are at risk of being pirated they add DRM, if somebody wants to publish games protected by DRM on their platform they allow it. That's not anti-DRM.

Steam's DRM is disabled by default, and Valve is aware it's trivially easy to bypass and said multiple times they don't care. That's just as "anti-DRM" as GOG if we go by their actions, rather than their marketing claims.

Don't fall for marketing claims when they themselves are using DRM, it's ridiculous.