Samsung has entire teams working on PoCs for just about anything. Including a lot of terrible ideas that end up in the trash (I personally worked on some of them :)

Facebook wanting to enter payments and money transfers through Whatsapp makes a lot of sense. But the fact it might be backed by some internal and centralized stablecoin is completely irrelevant to end-users.

So, who isn't? Look throughout the blockchain ecosystem and all you will see are scams, illegal activity and get rich quick fools. I have personally yet to see a use of blockchain tech for useful legal purposes. Yes, you will see some companies "announce" that they are "investigating" blockchain or whatnot to get some free PR, but you don't ever see them actually release anything useful.

(I fully accept that blockchain has revitalized criminal enterprises such as child pornography, extortion, and Ponzi schemes, but I don't see any reason to celebrate that).

It is hard finding legal and useful. There's a lot of legal but not that great like gambling.

A tiny fraction of companies in the blockchain ecosystem:

Pfizer, Fidelity, Microsoft, Rutgers University, T-Mobile, National Bank of Canada, John Hancock Life Insurance, J.P. Morgan Chase Bank, Ernst and Young.

If all you are able to see when you look at blockchain engineers are scammers, lawbreakers, and "get rich quick" fools, I'll humbly suggest that you haven't really been looking.