Please, I'm very sorry to announce what I'm about to say right now, because I just woke this morning and noticed that YouTube have Blocked/deleted all these videos which I posted on my channel for violating YouTube policy against gambling. Which is quite surprising, because there are other videos still on YouTube promoting slot games that never got blocked and deleted.
We had this campaign

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From the images you shared I can see a Duelbits video that wasn't deleted meaning one of YouTubes terms and conditions were violated.
Btw YouTube do give a reason for deletion and I would think it's in the lines of a copyright strike or something , check your dashboard well, an explanation should have been given.
Yes, it's obvious one of the terms was violated which resulted to YouTube blocking and deleting the video. But I just checked my dashboard right now, and this were the reasons given below 👇
"Content that promotes, facilitates access to, or link to an online gambling or betting sites isn't allowed on YouTube unless the domain meets local legal requirements and is currently certified by Google. Additionally, we remove gambling content that promises guaranteed returns." Here is the screenshot below 👇

Hence in summary, I'm thinking maybe it's because of the Title of the video I used that might have prompted YouTube deleting the video. Judging by it's policy
"we remove gambling content that promises guaranteed returns."