Bitcoin is popular among huge population all over the world while the demand for altcoins is limited. Does this mean there is least effect of whale manipulation on bitcoin among all crypto coins ?
I maintain an opinion that whale manipulations are more of a conspiracy theory than proven reality with Bitcoin. Bitcoin has a huge market capitalization, too big for major manipulations. Certain announcements or events that involve the movement of large amounts of money (billions of dollars) can have a short-term impact on the price, but those are not coordinated attacks. For instance, the price fell down significantly when the pandemic was announced in 2020, but that wasn't a whale manipulation. Similarly, the price went down recently amidst announcements of Mt Gox repayments, but no manipulation here either.
I believe that altcoins with low market capitalization are susceptible to manipulations, but Bitcoin is not like that and I agree that it's the least manipulated coin (in a sense that manipulating its price is almost impossible in practice).
I like your opinion, whales will not be easy to manipulate Bitcoin because the price of Bitcoin is already very expensive so if they want to manipulate the price of Bitcoin then whales must have billions of dollars in capital to manipulate the market price.
Unlike Altcoins whose prices are much cheaper than Bitcoin so whales find it easier to control Altcoins in the crypto market, but buying Altcoins is very risky because most Altcoins can only survive on the exchange for a few years.