First, let's note that you posted a comment on that question that was indeed quite rude and abusive to another member (not me). I deleted that comment and I admit it probably did negatively influence my attitude toward your question. I also admit that my "we're not a google this for me" comment was rude, so I've deleted it as well.
In another comment on the post, you said:
A question lacking prior research means it already has an answer
somewhere else, which is easily accessible on the internet. I would
highly appreciate if you provide a link to such an answer.
No, that's not what lacking prior research means, and that's the specific thing that motivated my "google service" comment. We're not required to either allow your question or point you to the answer elsewhere. It also doesn't mean there's an answer out there; it simply means you didn't invest a sincere effort at trying to find the answer. If you read the link given in the close notice, you'll see that the opening paragraph on the top-voted answer says this:
To improve your chances of getting an answer, you need to demonstrate
that you’ve taken enough time to thoroughly search for an answer
before asking your question. This saves the site from reiterating
obvious answers and helps to get a more specific and relevant answers.
The answer goes on to give more concrete guidelines, which this site adopted as policy since shortly after its creation in 2015. That answer also cites a broader question for the entire SE network dating back to 2013 that essentially says the same thing.
You included a link to a youtube video about a company that quickly designed a ventilator and retooled a production line to produce it using motors they already make, but as several commenters noted, that's not an example of a DIY ventilator. That's a product designed by professional engineers and assembled in a factory. It's by no means a do-it-yourself ventilator, so it's not really applicable to your question, which was about lives saved by DIY ventilators, not production of them. In other words, the research you included didn't actually apply to the question you asked. And that was my basis for closing it.
But the important thing you need to keep in mind is that closed questions can be reopened. If you had simply told us what you "spent more than one day" looking for but couldn't find and told us where you looked, that would have met the requirements. You can still do so and I'll be perfectly happy to reopen it if you do. The community can also reopen it regardless of what I think.