Sorry, can't help laughing here. Users on average are focused on their question, not a clear and succinct subject useful to all. I will occasionally edit a title if it's really bad, and move to the right forum too.
Expecting SEO etc - no hope. Be happy they get something remotely useful in readable English.
My site is worldwide, and we get people posting "x for sale" as a subject. We tell them very clearly to post WHERE it is like maybe which continent? You'd think that would be useful and obvious? Nope. How about including the price in the post? Nope.
Nudge, guide, remind is all you can do. We've been online since 1997. It's better now, but not a lot - people are people, and they will screw it up for you in every way imaginable - and some you can't. Get used to it 🙂 and enjoy the connections and helping people.