Or, with a little more detail: "Open Source" is defined by the Open Source Definition (https://opensource.org/osd https://opensource.org/osd), and clause 6 requ

Or, with a little more detail: "Open Source" is defined by the Open Source Definition (https://opensource.org/osd https://opensource.org/osd), and clause 6 requires no constraint of fields of endeavor. Which means, you cannot limit the purposes for which your software is used. If you wanted to prohibit it being used to train ML models, you could add this restriction to your license, but it would no longer be Open Source(TM).