With Pamac we try to include all given package formats and tread them equally. That is why Pamac supports ALPM, AUR, Flatpak and Snaps. AUR is included in the base Pamac and Flatpak and Snaps are optional plugins. AUR is more or less an extensions to the regular ALPM format - the ALPM - ArchLinux Package Manager backend library.
Pamac added a global search, which we had to drop, due to too many requests. Depending on the new features we add, the AUR goes down. This only shows that Manjaro and all the 3rd-party distros based on Arch, who use Pamac as their graphical package manager, created that issue, as we offer easy usability similar to the binary packages. So the problem is not only on our side.
The AURWEB was not designed for this high demand. You can assume the Ubuntu days might be over as many new users start to switch to some Arch-based distro.
A 6 hrs time span of AUR requests by Pamac when we added global search with suggestions from 4 months ago
So with the upcoming changes on AUR Metadata Archive (live) (#1161) · Issues · Applications / pamac · GitLab and upcoming RPC changes are all been done together to improve things with AUR usage for our user community and the wider Arch user community using our graphical package manager Pamac to serve an easy and simple platform to access Software for anyone with all possible package formats out there.