At this point it's old news that Ethereum classic was attacked, and for the life of me, I still don't understand why it's still alive and kicking, but the even does make me think of how vulnerable some blockchains must be at the moment.
Of course this does not affect POS tech or DPOS, but POW coins must be shaking at the knees as their hashing power slowly climbs down.
Funnily enough, there is no one we can really blame for the insecurity of the POW networks. There is no way to enforce miners to mine at a loss just to keep a particular coin safe from attacks.
Of course there are the attackers to blame, but the truth is that such behavior should always be expected. That is to say, if there is a flaw, you can bet it will be exploited by an attacker and counting on morality or ethics as a shield is comical to say the least.
I fully expect for more alt coins to die this way before this bear market is over. I can almost guarantee there are groups of hackers waiting for hashing rates to get low enough to launch a 51% attack and double spend some unsuspecting alt coin, more so if the coin is just barely off the first page rankings.
If I was a gambling man, I would say BitcoinSV is likely a target, not only because of its questionable birth that has made the project and it's leader some powerful enemies, but because it's likely to lose hashing power in big slumps at any minute now.