You are selecting a subset that confirms your bias.
Before version 30, there were various waves of high op_return transactions. It didn’t need v30 to make that possible. If only 8-12% of the network relays the transaction with a high op_return, it will be relayed to a miner. Either all the network has to run knots or it’s not gonna make a meaningful difference in high op_return transactions being mined. I prefer them to be relayed through the network of nodes than being paid for out-of-band to the miner.
All said, incentive for inscribing spam on op_return is low. Cause a spammer can choose to use inscriptions at a discount.
