To which relays are these getting send to? This is quite spammy which makes running free relays harder.
This is defined by 0xChat and is used for push notifications.
https://github.com/0xchat-app/0xchat-core/blob/main/doc/nofitications.md
Discussion
To the app's recommended relays, if you haven't connected to any of the recommended relays, this kind of event will not be sent.