Of course. If they don’t reveal their donors, they can’t be trusted.

I wonder… which kind of ‘think tanks’ are we talking about. Is it a enclosed isolated place where people can focus on their thinking undisturbed, or is it an armoured vehicle of information warfare?

Yes. They’re fucking puppets and mouthpieces if they’re not honest and disclosing fully

An execption to Betteridge’s law of headlines

Yes, of course they should be disclosed. Could be domestic or foreign bad actors or terrorist organisations for all we know.

But there will always be ways around it, eg put it few a few trusts or shell companies so that it’s not obvious who is really donating it.