Why did I randomly receive BTC from a sketchy wallet with billions of dollars in volume?

I know very little about Bitcoin or crypto in general, so sorry if this is a stupid question.

I have a wallet with a small amount of Bitcoin (~$100 worth) that has been sitting idle for many years. I randomly decided to check on it today for the first time in several years, and noticed that I received approximately $40 from a wallet in 2022.

The sender's address is bc1q8lrcj8dxk4kq92v5ujf694vmvgqwdrv78k3m4p

It is currently empty, but has a lifetime volume of over $7 billion.

After some initial searching, my best guess is that it was some kind of dusting attack? But $40 of BTC seems like a large amount of dust, isn't it?

I assume it's some kind of scam. I just don't understand what their goal is. This is a completely offline wallet