I can't quite tell if you're being serious or not, but just in case you are:
Literally every technology you listed there was a massive step forward technologically and was a significantly better solution for the problems they addressed...
You also skewed the question into a completely non-sensical argument - Obviously there are lots of websites that provide purpose beyond self-promotion.
I'm looking for one example of blockchain technology that isn't circular or self-promoting, and solves any problem better than existing technologies. Not some theoretical future use case, just one existing project.
Literally every technology you listed there was a massive step forward technologically and was a significantly better solution for the problems they addressed...
You also skewed the question into a completely non-sensical argument - Obviously there are lots of websites that provide purpose beyond self-promotion.
I'm looking for one example of blockchain technology that isn't circular or self-promoting, and solves any problem better than existing technologies. Not some theoretical future use case, just one existing project.