Ruskie.
Fortunately for me, mine involved relatives within NZ and Australia, and there was no great issue tracking down the people we needed contact with. But surprising how far nine siblings can disperse.
Legal niceties, I expect, would be similar in countries who have roots in the former Commonwealth. But could have been refined over time, by the various Parliaments, and judgement rulings setting precedents.
Regardless there is a 'duty of care' that is called upon, by all who find themselves in that position.
Otherwise personal liability can come into play. I presume also the size of the available Estate funds, may be a factor.
A [late] contributing co-founder of another UK based genealogical forum, had a specialized side business providing advice, and searches of UK records, to lawyers involved in settling estates.
He was of considerable assistance to me, when researching pre civil records in Scotland, and the UK, but did not charge those he assisted through a request, placed a upon the public forums. When I PM'ed him offering to meet some SCOTLANDSPEOPLE research he instigated, he replied that being active on the forums, offering help, was his hobby, and NOT an accepted commission for his expertise.
I therefore now offer to pay that experience forward, by offering to do look ups if going to the Auckland Archives to do research.
Alan.