My problem with squarespace is that 10 years ago I used to visit a few forums run on their servers, and every time I hit ESC in Firefox to stop animated gifs or to make a page stop loading/redirecting, it would navigate me to the CMS login page for the site owner.

Is this a problem today? No, I mostly browser on a tablet without a keyboard, I have no idea if they still do this.

Am I going to give them any money for this? Nope, the only thing I know about squarespace is that they used to intercept a browser shortcut to stop loading a page instead navigate away from the current page.