There is already an excellent answer out there, but the important thing to understand is that what you're offering isn't just a tool, you also publish the resulting copyright infringing video to your account. An easy solution to your problem would be to stop hosting your bot yourself and just provide the source code on github for interested parties to use at their own discretion. Nearly every post that bot seems to make seems to contain copyright infringing content.
Add to that that your bot explicitly acknowledges that the content is infringing in a lot of its posts in the form of "Audio courtesy of" messages and you can't even try to claim you thought nobody would abuse your bot. (Obligatory sketch)
Important things to know: You REALLY DO NOT WANT TO FILE A COUNTER NOTICE. As long as you just take everything down as quick as possible there won't most likely be legal ramifications. By filing a counter notice you are basically telling them "You are wrong, please sue me if you think you're right". It might take them time to sue you, but that's the next step in DCMA terms. Realistically what you want to do is to just delete anything with any third party audio track or third party provided visuals. Obviously videos with just text and nothing else should be fine.
Also worth noting, you might want to cancel and refund your fundraising campaign as quickly as possible, because that might make it a commercial project which is considered in a lot of different things around copyright. I am not a lawyer and my main focus isn't the US, but you already probably didn't fall under fair use from the start, when you start earning money (even if it's just to cover your cost) with the project it pushes you even further from any type of reasonable defense.
