I'd personally agree with that (hence my quotes around the having become part), although I'm not nearly caught up with the lore enough to know whether equating open source with the FSF and OSI is fair. Also can't vouch for the thread starter's opinion of course.
Makes me wonder what the general statistics are on individuals ignoring licensing entirely.
Time to go make the ultimate SPDX-License-Identifier with an OR clause between every single entry.