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That is a great point. Though, how do you know that "more and more" are?

I have read and heard at industry events that more wealthy individuals and family offices in the investment side are buying BTC. This also makes sense considering that major financial institutions are investing in the space (i.e. Goldman Sachs established a trading desk and their backed firm Circle is buying Poliniex).

Yes but I mean how do you know that the number (or size) of OTC trades are increasing? Is there any data for this?

I don’t think there is a way to distinguish them from the wallet transfer you can see on the blockchain. If you segregate the exchange wallets, I imagine it can be done. However, I do not have the actual figures. I am assuming it by what I have read and heard.