Earlier quoted context omitted.
When it comes to the "spirit", the people criticizing it seem to be talking about the "spirit" of Stallman and Free Software; the term Open Source and the OSI as an institution were explicitly built on friendliness to running side by side with proprietary software and to third-party commercial use.
Stallman has no problems dual licensing software and selling proprietary licenses to companies. His goal is freedom zero, the freedom of a user to use the software as they want.
RMS doesn't, but others also in the copyleft camp certainly have. E.g. https://sfconservancy.org/blog/2020/jan/06/copyleft-equality...