That is an explainable assumption but wrong, in my opinion. I am not a jurist but I believe that such issues would appear only in case of mass production. Think of it this way, does any of the tattoo shops pay anything for tattooing the Batman logo or any other logo for that matter? No.
The other thing is that for such companies like Marvel for example it would cost a huge lot more to track these unique situations down than what they could profit from this act.
And one more thing, these things like Spiderman, Ferrari or any other large group, company, logo or icon that are known and famed all around the world do have their own interest in having their logos and other items put on stickers, tattoos or even cue cases.
So far 594 people have seen this on this forum with the maker giving a hand for Marvel in making the Spiderman saga contemporary and not letting it slip under the surface and people forgetting it. And how much did this cost for Marvel? Not a cent.
These are my thoughts only and perhaps I made it up all mistakenly but still, I think I'm right (until proven wrong) and believe that the maker did nothing illegal or wrong.
I'd guess your wrong, and wouldn't be adding spiderman in the title of posts that pop up easily on google and in other searchable media. I'm sure in this case nothing will happen, but if it was sold on a retail site I'm sure there would be a nice cease and desist letter showing up.
Really stunning work, may be the best idea for a case in a very long time.