That seems even worse tbh. You are of course still downloading their content, but now you're also leaving out any money making possibilities the host site may have had in place. Even less likely to be considered "permitted".
Downloading and displaying content from websites in general (not a specific site(s) that you have permission for) seems much less common. I can't think of any other app I've ever seen that does that.
[0]: https://developer.apple.com/documentation/safariservices/sfs...