I’ve been using Keepass for about the past 15 years.
When you jump into the middle of a conversation, this is what happens. In fact, I already answered your question. Even though you seem to be acting in bad faith, and you're trying to get a "gotcha" out of me.... I'll elaborate a little
I use a Nextcloud Server (there are other network sync tools as well). I have the Keepass file on the server which syncs with my remote devices. If I make changes to the database, it syncs with the cloud server which pushes the changes to the other devices. I have NEVER had a situation where I needed to make changes to the databases on two or more devices in parallel, nor can I think of a use case. My guess is that in such a situation, whichever file was saved last would be the one last saved by Nextcloud (overwriting the other edit). So your "gotcha" is valid but rare. The other option is to use the web app for Keepass in Nextcloud (not sure if it's still being developed though, it's been a long time since I used that).
Anyway, the point of my question was to understand why people use a cloud service for this when it can be easily done (and be safer) than relying on a 3rd party cloud. From what I can tell it's "convenience".