If you don't have a subscription, you can still see the articles on a lot of sites by looking at the source (a bit yucky but the plaintext area is the meat of the article) or spamming escape (preventing the blockout before it hides the text) or using alternate browser (you can write a dumb html only browser or something old like lynx which cant process the blocker). But more tricks are better, esp with low quality sites wanting money for garbage.
I advise you not to block cppreference. It is a great source when you need detailed, up-to-date information. Neither of these sites should be considered authoritative, but the reference in this site has largely not been updated since C++11.
In cplusplus.com's reference's defense, some of its content is less verbose and more easily digestible.
But for which pages in particular do you think cplusplus.com provides better documentation, and why? Just curious.
cppreference.com is a wiki. If you think there's a way to improve the documentation on that site without sacrificing its accuracy, you're free to request a change (or change it yourself for some pages).
However, if a big part of your issue is with the font, then… why not change it? There are many browser extensions that allow you to add arbitrary CSS to sites. Pick one, add selectors for the parts of the page whose text you dislike, and choose a font-family that you like. Or you can get an extension that disables custom fonts for a page.
I would also recommend not to block cppreference. For a quick look cplusplus (while not up to date) might appear easier but cppreference offers a deeper insight and also has examples.
So cppreference is certainly worthwhile...
At times I find the formatting of cppreference a bit hard to read, until I tell my browser to zoom in and make the page appear larger.
Overall I prefer the terse and compact amount of information packed into a cppreference page. Too often I compare the same pre-C++17 feature between CPlusPlus & cppreference, and cppreference has more detailed info on one page. CPlusPlus either doesn't have as much detailed info, or it is spread across multiple pages.