What can be done to prevent the new Q&A site from devolving into the old one, particularly with respect to spam accounts?

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Is the new Q&A site doomed to eventually degenerate into the old one, or are there measures that can be taken to hopefully block the spam bots and prevent this from happening? A quick search found some suggestions on Askbot's own Q&A site: https://askbot.org/en/question/7893/suggestions-for-antispam-measures/