I think this depends on your country policy, if your country doesn't permit such, your account will be freeze.
This is Indian board, so basically anything we talk related to country India
In Indian crypto trading is not considered as a business. Nor, stock trading is considered as a business unless you are a broker.
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I am not quite sure about this part because I made some quick search and IT department states that any activity that's done with the intention of making profit is considered as business.
I do not think there should be any issues related to saving bank account being used as a way to credit your profit through crypto trading. I think this guy might have been spooked due to largely bank accounts still getting frozen after P2P amount gets credited. He is trying to relate that issue with saving account being used for trading purposes. Which I don't think is relatable as P2P bank account freeze is a completely different issue.
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AFAIK, the account didn't froze but the user transaction has been questioned by the banking side which is common though when we receive amount that's huge considering our average account balance and activity but the savings account can't be used is quite new to me.
I don't think crypto trading or making P2P transactions using savings account can be considered as a business.
In this case, banks cannot reserve the right to freeze our bank accounts. The only reason banks can freeze our account is when we are doing illicit activities using our bank account.
Money laundering, credit card fraud, scamming others etc... are some reasons why banks freeze our savings account and not merely for crypto trading.
I have been using my savings account ever since and I had no problem at all because I use the account for other TXs too, so the amount might get mized up and I always been keen on not to convert any huge amount even anything over 50K.