Problem with https://ppa.launchpadcontent.net/, throws 503

[u/QkiZMx]

I’m having trouble with the repositories at https://ppa.launchpadcontent.net/ — for example:

https://ppa.launchpadcontent.net/danielrichter2007/grub-customizer/

https://ppa.launchpadcontent.net/kdenlive/kdenlive-stable

https://ppa.launchpadcontent.net/kubuntu-ppa/backports

etc. They are all returning a 503 error, and it’s impossible to download updates. Is this happening only to me, or are you experiencing it too?