Yes, the marketing of state lotteries misrepresents their value and preys on the poor and misinformed. (Private casinos are just as bad.)
Because law and social-norm enforcement faces budgetary constraints in time/resources/attention, the (informal-not-really) "fallacy" of relative privation doesn't apply. We can only choose some activities to both demonize and punish; we should allocate that effort well.
State lotteries and state-sanctioned gambling monopolies are a lot more destructive than even dishonestly-marketed "cryptocoin IPOs" (where people know that caveat emptor applies and traditional legal recourse is difficult).
And, the enforcement action described here was against a fairly honest, successful cryptocoin venture, SatoshiDice, a far more moral operation than the California Lottery.
The SEC doesn't need to "do more", it needs to "do less". The government's limited attention, resources, and competence should be focused on crimes and fraud with real, actual victims. Not trivial violations-of-form.