Sometimes the creators do funny ways to introduce their sponsors, I really like that. For example donut, even if it's a fun skit they even place a progress bar on the bottom. It's the main reason I set sponsorblock to "notify, but don't skip the segment"
Other times instead it's the whole video to be secretly sponsored, like many unboxing channels. In that case sponsorblock should warn "error: no content found"
How do you feel about creators plugging their own product…for example, when Mark Rober (YouTube celebrity, engineer) plugs Crunchlabs (his subscription/box service for STEM kits for kids)?
well, in that case i completely hated the video. mark rober usually makes excellent videos, but the latest videos were just excuses to plug his crunchlabs subscription or that masterclass thing.
Harry Mack does freestyle raps about his sponsors. I think his bars about Keeps hair medication service and Nord VPN are just as entertaining as the rest of his stuff.