Also many of these look like they just adjusted the weight ever so slightly. With variable fonts, I'm curious how this come into play when considering copyrights.
https://www.bitlaw.com/source/37cfr/202_1.html
Note that although the design of the typeface is not copyrightable, the computer programs which generate typefaces (‘fonts’) contain elements which are:
When discussing copyright "font" doesn't refer to the shapes of the letters (which comprise a "typeface") but the programmatic implementation of that typeface, which has been held to involve independent creativity. So if you take an existing vector font file, and alter the control points, you've created a derived work.
The situation is different in many other countries, which do allow for a copyright in a typeface. Generally the term of copyright is much less for a typeface than for many other works.