I want to donate AUD 50 to the board, it just feels right.

Given the repeated assurances that the board is not secure, I wouldn't consider a credit card or Paypal.

I could get involved in cryptocurrency, but I don't like that either.

Ideally, I would put a note in an envelope and mail it to your postal address. Sure my money might disappear and you get an empty envelope, but I'm willing to take the risk if you are. All I need is a postal address.

Thanks for the offer, but I think it is best not to send cash through the mail. Whatever board security issues we have, they have nothing to do with whether paypal is secure.

I wouldn't take a donation from a self promoting rock spider trying to buy his way into acceptance and freedom to sell his Candyman  t-shirts here.
This person is a dead giveaway by his own making.
I'll pay $50 to have him gone from here for good.