There is no risk there, and nothing to factor. DRM has nothing to do with piracy, especially for older games which were and are widely pirated already. I.e. not releasing those games DRM-free means lost sales, point blank.
> Yes - pirates will still crack DRM and pirate games, however, that's a hell of a lot different than downloading a binary and having it run with no modifications whatsoever.
You miss the point. Once it's cracked - that's it. It's pirated forever since, and no further DRM would stop that. So again, not releasing it DRM-free means some sales will be lost and there is zero risk in such release.
> To suggest that DRM doesn't at least somewhat thwart mass piracy is ridiculous.
It doesn't. It actually is shown to increase it, especially for older games. Some most obnoxious DRM like Denuvo is shown to slow it down, just by the mere fact of placing draconian restrictions on usability, but even that is being cracked eventually. However such older games we are talking about don't use this trash most of the time.