Some people like doing this, like those who are into trading and chart analysis, they believe that when a big whale moves his funds into an exchange then something is about to happen or maybe the whale knows or heard something that they don't know.
I don't see any needs for me to do this because it's a big stress monitoring my crypto portfolio and also monitoring the whales wallets, as crypto isn't something I do full time I have other things that are occupying my time, I just buy bitcoin and hold for long term profit.
If you are so into Bitcoin trading it can be good to keep track of such wallets because you will be able to stay ahead of the game, I believe that trading in the bull is better and more possible to win some market prediction.
But this group of whales that can move the price significantly also has diminished a lot. It really needs a monster wallet to create fear in the market or motivate traders to decide to get out for some time or so, but tracking whales to adjust my own investment decisions? No, definitely not, but I think these whale trackers on former Twitter are quite fun to watch sometimes. It really has no impact on my belief in Bitcoin, but seeing when a few thousand Bitcoin get moved that were dormant for a decade, I think it can be interesting.