That’s Eric S Raymond (ESR) not Richard Stallman (RMS). ESR was an early and influencial voice in Free and Open Source Software (FOSS), advocating for a distinction between Open Source and Free Software, acknowledging the GNU Public License (GPL) would not work for all parties, some flexibility was need.

RMS is a GPL purist and against any form of compromise. Both made a huge impact and helped make the world and internet better. But they both contributed in very different ways.