This is a grey area. US markets also gives you access to leveraged and short ETFs, even Crypto ETFs. Nothing explicitly prohibits these, but if you look at someone like Interactive brokers who are regulated by SEBI as well, they have blocked trading in all of these for Indians. So I am guessing their stance is based on their understanding of the local laws here. The brokers who allow trading in these are those who are currently not regulated by SEBI.
So yea, donno. 
But it is always better to take a conservative approach on these if something seems grey.