Seems bots are not gaming the petition: https://britorbot.org/2019/03/22/revoke-article-50-petition/
If there were bots capable of boosting petitions on that site, why wouldn't they boost the No-Deal petition that's stalled at about 393k?
The amount I don't know about website security would fill many books, but as I understand the confirmation email system is relatively hard to replicate by bot.
@Emyr started
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Seems bots are not gaming the petition: https://britorbot.org/2019/03/22/revoke-article-50-petition/