Changes haven’t been implemented yet, SEBI has just released consultation paper. If these changes are implemented, as an option buyer, the premiums you pay for buying options will increase due to increase in contract size.
Another change is collecting option premium upfront, this doesn’t affect you as Zerodha user as we already collect option premium up front.
You can check what all changes SEBI has proposed here: SEBI's consultation paper on F&O trading
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Nithin had shared his thoughts here: x.com