https://www.youtube.com/watch?v=F9mPTQDF7Ok "This video is sponsored by Tempo."
https://www.youtube.com/watch?v=L0nTI-lwU1Q "This video is created in partnership with Nikon."
https://www.youtube.com/watch?v=FY8Yxw46TBQ "This is a Google-sponsored post"
They seem rare. Maybe only one in 2020.
There are also other potential income sources that weren't mentioned:
https://www.youtube.com/watch?v=rA9Ww5ffA3I "This is not a sponsored video, but I did use an affiliate link"
https://www.youtube.com/watch?v=J52T748MOI0 "This is not sponsored, but I did use an affiliate link!"