I think the two existing replies to this question already answered this mostly, but I would define a "working" sponsorship as one that makes me consider buying it. Sponsorships that are basically just an add I don't even see thanks to SponsorBlock for example. So those are "not working" for me.

But for the LTT screwdriver or the bamboo labs 3D printers where I see how they can be used I actually consider buying them or have already done so. One factor for this is obviously that they can't be skipped, but the bigger one is that they are obviously more relevant for me as I am already interested in the video's topic and therefore the products used in it.