No, you're not just "archiving". Besides the point that archiving itself is already in a legal grey zone, at the very least it has the defence that it presents the website unmodified, in exactly the same state for no other purpose than showing the web as it used to be. Like file-sharing websites, archive websites rely on the fact that it's an automated process and they can continue to host anything until they get a DMCA takedown. Not to mention organisations like Archive.org are literally run by librarians which gives their argument of preservation a lot more weight.
When you're stealing assets and adding your own tracking code, you're transforming the work, which is a definite no-no for copyright and trademark law. Not to mention that by intercepting traffic which was meant for a competitor you're literally interfering with their business and risk fraud charges.
No, you're using their content to gain financially, and in this instance, at their expense. And that's putting aside all the other possible counter-arguments, of which there are many.
I'm no fan of long copyrights, etc., but in this case to me it's a clear cut case.
When you're stealing assets and adding your own tracking code, you're transforming the work, which is a definite no-no for copyright and trademark law. Not to mention that by intercepting traffic which was meant for a competitor you're literally interfering with their business and risk fraud charges.