That is not how we define open source. See:

https://opensource.org/osd

Openness is much more than “source available”. Open for use by others is an important part of that.

"unlicensed open source" exists, however -- it is a real thing, referred to as open source, despite that it cannot be used legally.

i.e. https://www.synopsys.com/blogs/software-security/unlicensed-...