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Nearly everyone had a beatable blackjack, counting deposit bonuses, back in the day. They called it "Casino Whoring" or "Bonus Whoring." I started my poker bankroll that way and later moved into professional poker (HUSNGs).

I turned $100 into approximately $3500 with the whoring. My expected value was something like 2900--I got lucky enough to beat the table in addition to earning the bonus.

Many of them were something like "deposit $200, get $200 bonus, have to bet $xxxx before you can withdrawal" with approximately a $190 expected value if playing $1/hand blackjack, perfect play.

I didn't think it was any surprise to the casinos that they were beatable--I assumed they just relied on them as a loss leader.