Great DoS potential! Since pushing an event doesn't mean you're able to sign, just pick whatever events of other people and push them to this relay, get a bunch of such messages that *those* people receive, not you, lmao!
from my logs they probably restored an outdated backup and all channels were force closed because the height on their side was lower than on the peer side, a few hundred updates off but not 0 (which usually indicates channel recovery request). But what's even worse is that they had one penalty tx:
3M sats just found a new home, whoosh!
Poor node, but a good lesson for everyone: don't backup your channel database, make a static backup instead. If you lose your state you _have_ to force close _all_ channels (or, to be precise, ask your peers to do so), there's no other way. It's cheaper than losing everything to penalties.
In this time and age it's so much more important to define what your project/protocol is NOT than what it IS. And then follow these limitations strictly. Knowing the boundaries is extremely useful as then you can carefully plan and build within them not inflating the purpose.