If its useless then why would people buy it? If its useless then why its still very known and used by many? If it's useless then it will never be on top leading currency that people bought in these days. Calling it as useless is not true because bitcoin has already showed its potential to dominate other currency such as fiat. Bitcoin has a great potential in every aspect as lots of people are adopting and using it now. Bitcoin will be good as gold or much expensive than gold in the near future as its very limited suxh as gold or any other materials.
It's not true that bitcoin is useless, we all holders know that, people who said bitcoin is useless is maybe the person who bought bitcoin at high price and now they actually lose their money. This is can be the reason why other people will says that bitcoin is useless Because for now they can't see it worth all they see is their lost.