How paid plans work
Builder and Studio are arranged by email with [email protected] and billed by invoice. There is no card on file and no renewal running in the background.
Ending a paid plan
Write to the same address. What happens to your projects is agreed in that conversation; nothing is deleted without you asking for it.
Your files either way
At any point you can download every file of a project as a ZIP. It is plain HTML, CSS and JavaScript that runs on any static host, so leaving Marcus never means losing the site.
Deleting for good
Deleting a project removes its record, every revision and its files from the server at once. There is no undo, so take the ZIP first.