I believe this is talking about the original AltStore, which uses the same mechanism that app developers use to test their apps on device as they’re developing and works in any country, not just the EU. You run a Mac app on your local network called AltServer, then the AltStore app on your phone can automatically send .ipa files to the server to get signed or re-signed. As they mentioned, with a free Apple account the signed app is good for 7 days before needing a refresh, if you pay Apple for a developer account it’s much longer and you can have more things signed at once.
However I’m in Canada. Sideloading isn’t allowed here yet by the government or Apple.
I believe this is talking about the original AltStore, which uses the same mechanism that app developers use to test their apps on device as they’re developing and works in any country, not just the EU. You run a Mac app on your local network called AltServer, then the AltStore app on your phone can automatically send .ipa files to the server to get signed or re-signed. As they mentioned, with a free Apple account the signed app is good for 7 days before needing a refresh, if you pay Apple for a developer account it’s much longer and you can have more things signed at once.