Hmmm that use case would kind of be a bit frowned upon.
Banning people in a new channel for breaking the rules in another channel is a grey area and probably not advisable.
Given that such a spam bot being discussed here, is likely to get a global ban from Twitch and thus not even worth banning in another channel as Twitch bans the accounts.
Basically banning uses in another channel for breaking rules elsewhere is a bit of a no no, and thus doesn’t apply.
It is NEVER a reasonable requirement to be a spamming a channel with messages or commands, globals are more there to protect against bot’s misbehaving