So.

A new variant appears out of nowhere with a completely unclear evolution pathway, spreads twice as fast as Delta (despite not being related to Delta) and causes only mild symptoms - despite researchers saying that the coronavirus likely has not much evolutionary pressure to reduce lethality.

I guess "positive" conspiracy theories are less appealing, but I'm surprised there has not been any speculation yet that some "good samaritans" could have bioengineered this variant in an attempt to end the pandemic.