"Security" on behalf of the user is a complete red herring. You can't print to my 2d printer or my 3d printer, but I can, with "any old device or application". Because they're on my network, not public on the internet.
This is basically the equivalent to having passwords on a MySQL database or redis server.
Why on earth would they add a subscription? That makes absolutely no sense business wise. No one would buy their printers, and they don't have a captured market to strong arm anyone.
I personally do not want my printer connected to any vendor's server in any way...IMHO, there is no reason for it.
[1] https://www.reddit.com/r/3Dprinting/comments/15sfisq/bambula...