uBlock is one option and there are many out there but without commenting specifically about the member that has his videos online, just in the general sense (when it comes to gathering data about what the average viewer is doing) ads are doing much more than just showcasing a product or service. They are used as trackers too therefore should be blocked to increase privacy.
But you put too long ads before the video. For a channel that barely has any followers it doesn't seem like a good strategy. Better to put few and short ads at the beginning.
Use brave (disable its native adblocker) + ublock origin and you won’t be seeing any ads unless it embedded in the content video which seems not to be the case according to the reply above. I still find it fascinating seeing people using the internet without any adblocker software. The internet is the new TV. Unless you fight back, you’ll get overflowed with ads