I posted a comment that gives a few of my thoughts as to why. How do you propose those problems be solved?
But what's you're next step? Someone comes up and marks that they feel really lonely. Do you get contact information? Invite them to something? (Invite them to what? You may have to create something - a board game night at your house, or a "lonely people shopping together" time at a grocery store, or something. You probably have to create that "something", because you're the one who's able to at least reach out, and the ones who are responding probably aren't there yet.)
You're finding people that need something. The next step is to find a way to connect them - with you, or with each other, or with someone.
For any activity you come up with, some people won't be able to, due to time or temperament or personality or something. So maybe what you need is more than one. (Eventually. Look, don't get overwhelmed by that. Just one is the next step, in my view. And maybe some helpers.)
I'm not sure I'm the right person for that. I live in a suburb, not the city that I do the surveys in. And I'm extraordinarily boring, and too old.
It seems that I should try to think bigger. Try to find a way to help these people connect with each other. Something in person, not an app like Hinge. Maybe, hold a sign that says ad hoc meet and greet at such and such time and place, after collecting a list of common interests and putting those interests on the same sign that says the time and date. That could work.
It was a great low key meet up. You didn’t have to make friends with the organizer. If you were walking with someone you didn’t really like in the group, it was easy to drift to talk to someone else.