Zero, since I don't have any notification enabled on Gambling discussion.
Thank you. I didn't notice that all those threads were only coming from gambling discussions, so now I removed them from the tracked board and unmuted the chat, which helped to resume.

I received more than 1000 notifications just today alone from the spammers.
Everything works normally for me, I haven't noticed anything unusual.
What kind of spam do you get from this bot?
Every notification contains a link to the post which is the reason for it. Did you accidentally add a phrase you want to track, but it's a frequently mentioned word? For example, if you added that the bot notifies you every time someone mentions the phrase 'Bitcoin', you would get many notifications.
I haven't done anything wrong and the spam is similar to
This Free Amazon Giftcards Method spammers., the only mistake I made is tracked the gambling board which is where they posts these spam links.