@sawaba @reijomancer @GossiTheDog
Excellent question.
Yes, all major operating systems do in fact allow screenshotting,
however!
Use of the snipping tool can be disabled for some or all users of a system with a registry entry; this control is made ineffective by Recall
Use of the snipping tool or a third-party application to make screen captures is an auditable action; Recall performs these captures automatically
User-controlled screen capturing is not inherently indexed nor processed in ways that make the contents machine-readable
User-controlled screen capturing does not necessarily have a consistent location on-disk where the records of such captures are stored, where an adversary would be able to script wholesale extraction of said records
There are other issues as well, but these are sufficient to make the point that recall's automated screenshotting, collation, and storage of captures without the specific agency or control of the user is sufficiently different from the prior model as to need a recontextualization and re-evaluation of extant controls to determine efficacy.