Right now there are more coins available in the market which gives you more profit than bitcoin.
Bitcoin price is also not stable.
All these factors affect its popularity ??
What you think, still bitcoin is more popular ?
I am afraid that is not true.. One of the reason why bitcoin decreases its value because there are people who always talk negative about cryptocurrency because it can really affect business of other business man who are not in favor of cryptocurrency. But then again, decreasing the value of bitcoin and other altcoin is just part of the process, along the way Bitcoin and other Altcoins will increase.
