https://distrowatch.com/weekly.php?issue=20180702#qa
Topping-the-charts asks: What caused Manjaro's rapid rise in the PHR stats? Are they really that popular or are they gaming the system?
DistroWatch answers: Before getting into the apparent rise in interest where Manjaro Linux is concerned, I'd first like to remind everyone that the page hit ranking (PHR) table does not necessarily reflect the number of people running a distribution or its quality as an operating system. The PHR table displays the average number of visits a project's DistroWatch page gets per day. (We filter any duplicates from the same IP address.)
With that out of the way, what caused Manjaro's PHR counter to jump over 60% in the past twelve months while most other distributions in the top ten maintained fairly steady numbers? There are a handful of possibilities and the answer is probably a combination of factors. I suspect one of the big factors is Manjaro started publishing near-weekly updates, plus various pre-releases and community spins. This resulted in more announcements, more people talking about the latest snapshots, more news sites linking to the new media. The PHR tables tend to reflect the amount of "buzz" around a project rather than the number of people using it and the more frequently a project publishes fresh media, the more interest it generates, causing it to rise up the charts. Most projects get a little bump in our PHR when they publish a new version and Manjaro's installation media is on a rapid update cycle.
PHR rankings sometimes have a positive feedback cycle too. Once a project climbs a little (possibly because of a new release) more people see it near the top of the charts. Then more people talk about it, which gathers more attention and the project climbs more. The same thing appears to have happened in the past with Linux Mint and PCLinuxOS, and may be happening with elementaryOS at the moment.
I would also observe that Arch-based distributions are fairly popular right now (new ones are added to our waiting list virtually every month) and distributions which can take Arch Linux and make it easy to set up and use (as Manjaro's team has) is something a lot of people seem to desire right now.
As for the question as to whether someone is gaming the PHR system, I feel that answer has two parts. The question appears to imply that the Manjaro team themselves are somehow trying to boost their PHR rank and that idea strikes me as highly unlikely. The Manjaro developers have lots of better things to do with their time and don't directly benefit from having a higher PHR spot. The second half of my answer is that while some community members (of one distribution or another) sometimes try to encourage people to visit their favourite project's DistroWatch page, any bump in traffic tends to be short lived. It also tends to be small and cancelled out, effectively, by fans of other projects doing the same thing. To date, we have not discovered an evidence that increased interest in Manjaro is anything other than the combination of factors mentioned above, which when added together, caused a rapid rise in PHR numbers.