Bitcoin is not anonymous but it provides users with a good level of privacy. Any "successful" whales are not going to put themselves at risk by leaking any personal information including their wallet address
es. Anything you can find with a blockchain analysis or looking at the "rich lists" is the big public services such as exchanges that are holding their users' bitcoins not their own (they are custodians).
Like famous successful youtubers btc addresses are?
If any of the idiots on Youtube speculating about price were whales they wouldn't have been wasting their time making videos. LOL
But apparently, there are some master predicters who are right most of the time and they've been doing this since the early days of bitcoin. Seeing what they're gonna do is prob a good indication of what's about to come.
Even if you knew addresses of a big whale who successfully makes profit you still can't know when they make a trade because moving bitcoin on-chain has nothing to do with making a trade on an exchange!