Yes, I guess we all know that bitcoin is a decentralized coin which we cannot know the people or who are the people behind or buying it.
It's somewhat useful to follow the main chain coin movements and the days most of it is being transferred. By far, most of the value transfers occur from Monday to Friday, which could and likely does indicate professional presence.
The thing here is that people think of institutions as being banks, large corporations, billion dollar hedge funds, pension funds, etc. Institutions can be smaller entities too, and even the crypto funds that got rekt last year are technically institutions.
Security nowadays is more of a thing than ever before, and we see how large entities owning a lot of coins on behalf of their users no longer store their coins in one or two addresses, but hundreds of different ones.
The more addresses you use, the more difficult it is to figure out who the coins belong to. People not that long ago were speculating about an 800k BTC whale, but it turned out to be Coinbase.
People didn't know it was Coinbase till Coinbase itself said so, which shows how important it is that you use many different addresses instead of just a few.