Actually they all made physical type to use in their own presses, which was sold on to other people after they passed away. It's only been possible to copyright typefaces in the UK since 1916 & it still isn't in the US, but even if modern copyright law had applied when they were all working the standard term of life + 70 years would have expired by now for all of the designers I mentioned.
What Monotype, Linotype & Adobe do undoubtedly own is the rights to their own digitisation of the pre-existing typefaces & I'm not arguing they shouldn't, just saying that I sometimes have mixed feelings about how vigorously they defend work that wasn't originally theirs.
Of course, if I did have the skills there would be nothing to stop me getting hold an example of one of Caslon's original specimen sheets and making my own digital font based on it. But I don't have the skills, which is a big tick in the 'pay the font designers' column.