This has seemingly been an issue for a long, long while (years?) but I only realized some funky stuff now today. I searched the forums for answers and came up empty, and I don't see support channels for the website itself... hopefully this is the right spot? If not, let me where to go and I'll happily report the bugs to the proper place. The shortest gist of it is that the RSS feeds for portableapps.com are labeled incorrectly, nonexistent, and off-site too.
To find it, go to the home page, PortableApps.com, scroll down to the "LATEST RELEASES & NEWS" block. There's two links at the bottom, "All Releases & News", and "Just New Apps". There is also only one RSS feed that is discoverable on the page. This RSS feed goes to this link:
https://portableapps.com/feeds/general
Which redirects here, and mirrors the "All Releases & News" page 1:1
http://feeds.feedburner.com/PortableAppscom
The "Just New Apps" feed was killed off at one point (and is the one I'm interested in mostly), so looking for it I took the first link and went one subdirectory up to arrive here:
https://portableapps.com/feeds
This is where everything goes bonkers. That is a valid webpage that lists four RSS feeds, and only one is an actual RSS feed. "Frontpage news" is the RSS feed that is discoverable on the home page and works fine. "Apps" is a 404. "New Apps" is a "Freeware" listing, and "Updated Apps" is an "Open Source" listing. Those latter two don't have relevant use cases anymore but the data is current, and there are RSS feeds behind them to boot.
I'm thinking the page I found is simply an old relic, but why there isn't a "Just New Apps" RSS feed remains a mystery...
Hopefully this is the right place to report this bug, but if not, again please let me know who to tell and I will happily do it! I just couldn't find any sort of better contact method searching through the support pages and the forum too, all the stuff on the support pages seemed to be related fully on software devs getting in touch with the PortableApps platform, which didn't seem correct.
The only RSS feed we have ever supported or wanted people to use is the general one. Drupal just happens to enable all sorts of random ones, to which people subscribe with poor RSS readers that fetch the full feed every 5 minutes, which slows down the whole site. So, everything is disabled except the main one and that is cached by FeedBurner.
Sometimes, the impossible can become possible, if you're awesome!
Mystery solved then. Drupal just being Drupal