How do we know if broker is selling order flow to high frequency trading firms?

I know there are some free brokers out there like Finvasia , wisdom capital …There is one broker named Robinhood in USA.

They are also free brokerage …no fees…but because they have to disclose by law …they disclosed that they clients’ sell order flow to high frequency trading firms and get paid for selling clients orders.

So should I assume brokers like finvasia and wisdom capital do the same and not telling clients ?

No need to assume, it is not allowed in India,and I personally believe no one in India has real infrastructure to do this and hide from regulators as of now, also above brokers charge on monthly basis for using their platforms and charge for extra features they offer. Just that their business model is different.