> The weirdest is that some ISP are blocking it and some are not. So why is that the case? Are some ISP not listening to the government?
From experience being blocked from time to time in many countries...
Most countries that block things ocassionally just aren't very good at blocking things. They might not consistently communicate with all ISPs; it's pretty common that all mobile ISPs will do blocking but no wireline ISPs do it. Sometimes only the major ISPs get asked. Sometimes they get asked and don't block for whatever reason. Sometimes ISPs take a long time to update block lists. Sometimes they'll block things from DNS, but only for people using their DNS servers.
Best in class at blocking is probably the great firewall, but they sometimes do inconsistent blocking on purpose.
As a sibling said, it's best not to bring up the inconsistencies if you find the right people to ask. If you haven't already contacted the TRAI (telecom regulatory authority of india), that's where I'd start, but I dunno.