In case anyone else has this problem, it turns out you have to go to the privacy settings immediately after trying to open it otherwise it will completely ignore you tried to open it, there it will then say muddy isn’t authorised but you can authorise it if you want

Hi I've just got a new MacBook air and its running Big Sur, unfortunately it appears apple now requires all programs to connect with it over the interweb and confirm it isn't a menace, I'm completely unsure what needs to happen on your end to ensure I can use Mudlet on my new Mac, but would love to ...