While I'm unsure where I will vote, I actually think that this proposal did a great job by presenting exactly one concrete suggestion:

Splinterlands will create a temporary ranked mode with anti-bot measures. The league will be a copy of the current ranked system with the addition of anti-bot solutions. Fifty percent of the current reward pool will be used to fund rewards. At such a time when humans and bots can compete equally as per the intentions of the Splinterlands team the leagues will be merged again:

This proposal is clear, concrete, and fully within the capacity of the DAO to decide where it wants to allocate SPS:

• "bots-allowed league" and
• "no-bots-allowed league."

While it presented some suggestions, they are clearly just suggestions, and not part of the proposal. This avoids muddying the waters by defining the anti-bot measures as a part of the vote.

That is really the only way the SPS DAO can use their powers to address this. The DAO doesn't have control over implementation, and doesn't have the data that Splinterlands has as the game developer. Further, the DAO doesn't need to split itself on whether they want captchas, bot tokens or API restrictions, and can simply decide:

Do we want to split SPS rewards again into more leagues, if it means we try to eliminate botting in some of them?