I'll amend my comment as it seems to have confused a few folk on the meaning of "public".

Yes you should be able to say "don't use this", "for education purposes only", "this is a demonstration", etc.

Well there's already a statement in almost every open source license saying there is no warranty or expectation that it works at all, but sure let's tack on 'for education purposes only'.

It'd be the same result as California's law leading to 'this may cause cancer' printed on so many items no one even cares any more.

I'll amend mine to seriously endorse the idea that there should be a software supply chain that is verified to the degree that's possible and should hold liability. and ramps from world A to world B. this idea that you can hoover up a bunch of slop from the internet, sell it, and not be responsible in any way is really the problem here.

Fully agree

You mean, something like this?

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

No - I mean something like a banner at the top of the README or at the homepage of the documentation that states, as boldly as feasible, something along the lines of "THIS IS A PROOF OF CONCEPT/DEMO/FOR EDUCATION PURPOSES ONLY SOFTWARE THAT SHOULD NOT BE USED IN PRODUCTION"