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 Nothing is free, they are making money somewhere else 
 Agree. But where? (Genuinely wondering)
In any case, I never said it was free, its zero fee. 
 On your smash buys they charge a some bips.

But if you DCA and patiently withdraw, no fees. Just a small spread for their liquidity providers. :-) 
 It's a good question to continuously be asking. As far as I know, just the spread. In a custodial exchange, your buys may not be onchain, could be just within their existing system. Sending OUT of strike I think has to be on chain. You can perhaps find it on a block explorer to see the fee.