Every user that is not muted can vote.This means that you can prevent anonymous users to vote by using the ["{{% livechat_label livechat_configuration_channel_mute_anonymous_label %}}" feature](/peertube-plugin-livechat/documentation/user/streamers/moderation).
If "{{% livechat_label poll_anonymous_results %}}" is checked, votes won't be shown to other users.If unchecked, votes will be publicly visible as you will see message like "!1" in the chat.