That's https://en.wikipedia.org/wiki/Source-available_software , not 'open source'. The latter was specifically coined [1] as a way to talk about "free software" (with its freedom connotations) without the price connotations:

The argument was as follows: those new to the term "free software" assume it is referring to the price. Oldtimers must then launch into an explanation, usually given as follows: "We mean free as in freedom, not free as in beer." At this point, a discussion on software has turned into one about the price of an alcoholic beverage. The problem was not that explaining the meaning is impossible—the problem was that the name for an important idea should not be so confusing to newcomers. A clearer term was needed. No political issues were raised regarding the free software term; the issue was its lack of clarity to those new to the concept.

[1] https://opensource.com/article/18/2/coining-term-open-source...