Sticky tape
The first thing that happens when you have dropped a roll off at a lab is that the tape is removed and thrown out. So what's the use of having an address on the seal?
And if you process the film yourself...
So they may be cheap, these labels with your name and address. But not as cheap as ones without. And of no more use than ones without. So too expensive.
Many years ago, I worked in a lab, where one of the customers used to seal the end of his 120 roll film with the gummed strip provided by the manufacturer, as well as cellulose tape (aka "Scotch Tape). And not a little, either; after applying the gummed strip, he would tape the end of the paper down with a piece of cellulose tape, crosswise, and then proceed to cover the entire width of the paper, with three strips of cellulose tape. I had a few occasions to handle his film when he had also wound the same tape from end to end, starting at the end of the plastic spool, over the paper, over the other end of the plastic spool, back onto the paper, and finally onto the starting point. Then, he repeated this, after giving the spool a 90-degree turn!
I watched him "prepare" several rolls like this one day, at the front counter, and he handed them to me with the comment, "...I want my film to be SAFE!" I had been warned by the owner not to challenge him on it, as she didn't believe in p****g off good customers. I took his film, smiled, and went to process it. The thing he didn't know, and might have known, had he ever actually processed a roll of film, was that the glop he stuck on the paper had to be removed outside the darkroom, with a razor knife, making his film less safe. There was nothing like wrestling with his film (on one occasion, all 20 rolls of it), when time was short.
Most customers just used the gummed strip provided by the manufacturer; another photographer, who arrived one day with 80-odd rolls of 120 film, apologized because two rolls had a single wind of masking tape on them, a problem very easily dealt with. He told me that when he was shooting, he always had a roll or two of masking tape with him, and since that day, so do I. A permanent part of my 35mm or 120 kit is always a roll of 1-inch or 1-1/2-inch masking tape.
BTW, the Fuji Neoplan 400 film I have, has a self adhesive strip on it.