If you read news like this
https://www.ccn.com/mysterious-asian-whale-begins-funneling-funds-back-to-huobi/ that there is someone who has mysteriously bought a large amount of bitcoin. Then sell. All I can read is that Bitcoin has a fan of "Giant" who likes to invest and sell Bitcoin. This means Bitcoin will continue to run. What to worry about? What I do not want is if there is no Bitcoin buying and selling activity. Because that means Bitcoin no longer has any interest. That's what I should be afraid of.
This is just My Opinion Personally. Please fix it if it's wrong.
May be you are not a bitcoin trader but even if you are not but you are a holder of bitcoin which means you should be concern what is happening to the price in the market. There is no denying it that there are whales in the business of bitcoin and whatever action they takes has an impact on the value of bitcoin because the sentiment generated by the action of the whales will touch the price in the market.