Bharti Airtel. One of the biggest ISP in the world & particularly large in india . Has blocked all crypto block explorers. All etherscans are not opening through their SIM cards. 
https://internetfreedom.in/airtels-ai-driven-internet-filter-poses-censorship-risks/

Before any retarded larp tells you that ability to not being able to run a node is not important. Tell them to fuck off.  
Don't give me the sorry excuse of VPNs. If goverment wants they can make sure entire generations have not even heard the name of a VPN.

Though its not a full blown attack on crypto & some websites are still working.