From past experience with devs saying they'll add a Linux version or LAN/couch multiplayer support later, it often remains at the talk phase and doesn't happen.
I don't think it's bad intentions. I think that when they make those claims, they genuinely believe they'll get around to it.
Part of it is the dev can-do mindset. We all like to please our users and we always imagine things will get done in less than half the time it really takes (there is the idealized path to development and then there is the real-world path to development with technology often not cooperating).
Ultimately, I want to encourage developers who make ownership a priority, not an afterthought. They should build it into the game from day one.
In the grand scheme of thing, it's the simpler path even. The only reason why drm is considered easier now is all those stupid platform integrations that poped up everywhere where dominant platform owners worked like crazy to shoulder the overhead of persistent centralized networked services, in order to make it the path of least resistance for devs... and all those network service platforms that are maintained like services are financially propped up by things that are sold as goods with a single fixed payment.
When you stop a second to think about it, the dominant business model that those service operators (GOG, Steam, etc) subscribe to is a little insane. It is certainly not meant to be a viable long term solution.