Congratulations... We can have huge blocks and our 0 confirm transaction system is not less secure because of segwit.
0 confirmations were NEVER secure, only an idiot would think otherwise.
The fact that you have huge blocks and the usage is even less than Dogecoin should really make you think twice. How can you not see that huge block space is a big target for anyone with enough funds to start a spam attack and clutter the network? (I mean, someone serious, unlike the Bitpico scammers)
there is no point spam attacking something that is not used. a spam attack requires incentive so that the attacker gains something out of that attack. it is never done for trolling or having fun! LOL
for example the spam attack against bitcoin had multiple possible reasons: altcoin pumpers pumping their altcoins with the premise that bitcoin is slow and they will replace it. big blockers spamming bitcoin to say we need bigger blocks. the miners spamming bitcoin to earn more fees as the fees went to the moon. government agents wanting to destroy bitcoin or at least slow down its adoption.
but what would you gain by spamming BCH?!!!