Financial Times has a good summary of the rules that went into effect on Feb 1, 2019.

The tl;dr version is this:

The intent is to protect the marketplace from competition that has an advantage of ~70x spending power. The two largest online marketplaces in India are now effectively American owned - Flipkart (now owned by Walmart) and Amazon.in (owned by Amazon).

Amazon was especially effective at creatively circumventing existing rules wrt marketplaces and owning inventory - see Cloudtail. However, given General Elections in 2019, Reliance's clear intent to launch into commence and payments, the signs are certainly present if this is protectionism under the aegis of preserving competition.

There are a couple worries here: