There is no lock in effect. It does not add a new Block Editor/Gutenberg Block and relies solo on the standard WordPress Gallery and Image Block. You can deactivate this plugin at any time and your Gallery and Image Blocks will work as they’ve done before. Just without the lightbox.
Just one important thing to remember: You always have to select Link to → Media File for all of your Galleries & Images to work properly. If you choose None or Attachment Page it will not work. But that’s fine if you don’t want the Lightbox for a specific Image or Gallery.
And these were some of the castle, which were very interesting.