Not missing your point, just disagreeing that it is a better solution than giving the true source instead of disassociating it from where it was found. Granted the original database is named although its location is not given and the fact that it was copied from Ancestry is also not present. Perhaps if proper source citation was used on the shared page it would be acceptable. Further, what happens if Ancestry changes policy and locks those shared pages down behind the paywall. You aren't any better off if that happens. A link isn't a proper source citation.
Finally, the same data, although not the same image, for the example, is available at FamilySearch, FindMyPast, FreeBMD.org.uk and parishregister.co.uk I haven't looked any further than those but found it on my first 4 tries. I don't have a UK membership in FindMyPast so haven't looked at the image there and ParishRegister.co.uk does charge.