What do you mean by Pro users?
What does the I-T department mean by 4-5 lakh HNIs as in the news reports? Who is HNI under their definition?
Considering 20 lakh active traders in India, about 70-80% have registered in the current tax year, so how can they be served notices for evasion??

There is no taxable event for buying, only for selling in rupees, so what do they mean by sending notices to 'investors'?

So many questions and this all reeks of overreach and tax raj / vasooli.