We now have no one "main net" with sharding technology and people are still doubting a bit. Thank you.
https://bitcointalksearch.org/user/vitalik-buterin-7314
Vitalik was last active on this forum more than 2 years ago so he is not following this topic anymore. You asked this question at wrong place there are so many ways exist to raise this question like Twitter if you really want to know about this.
https://twitter.com/VitalikButerin
i know, i want to try to provoke him asking question, who knows, maybe he still reading his thread. Would be great if yes and if he come back here.