Suppose a data controller provided a privacy policy, detailing the information that a data subject must have or be provided with under the various articles of the GDPR, including 13, 14, 15, 22 and 45. If this is available on the open web over "normal" https then their responsibilities are discharged, as would those whom they transfer data with.
If this privacy policy was only available by the download and installation of Digital Rights Management (DRM) software would their responsibilities be appropriately discharged? It is worth noting that the primary (only?) choice for many has absolute contractual requirements, significant privacy implications and at least philosophical security issues.
The example that prompted this question is the privacy policy of Falcon Sensor from CrowdStrike which in this question I wrongly attributed to a "Free Registration Wall". It is very far from certain that this has anything to do with DRM, I do not know enough to even say if this is what it would look like, certainly not enough to figure out if this is the cause. However "visible on Safari, not on firefox/brave" is what I would expect to happen if it was. It does not really matter, if this is legal then it could be a useful tool for companies to track their users, if not people should be aware of it.