I have a question. Will twetch be able to make private "dir…

There is always a fee required for miners to process the transaction

But it's not a transaction. It's just an encrypted message.

So you mean DMs should not be stored on the blockchain?

I wouldn't like that. I want to be able to prove what DMs I sent or received in years to come.
It's not in the spirit of BSV to sidetrack transactions and messages.

If you want your message on the Blockchain forever simply put a price tag for your inbox.