@wolfgang59 saidThat page lead me to this interesting discussion [1] on chessbase from a while back, as well as an interesting game theory paper [2] on the Soviet era Grandmaster draw and the extent to which Soviet players colluded by agreeing fairly quick draws between each other and playing for a decisive result with the intention of ensuring that the World Championship challenger would be a Soviet and so ensuring the Soviets would hold onto the World Championship more or less indefinitely. So Bobby Fischer's achievement in actually getting as far as being the official challenger is even greater.
See https://en.wikipedia.org/wiki/Milan_Matulovi%C4%87 for abuse of this rule.
[1] https://en.chessbase.com/post/the-bilbao-draw-feedback-from-our-readers
[2] https://papers.ssrn.com/sol3/papers.cfm?abstract_id=905612
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@DeepThought
What it is is that the behaviour among amateurs
As an amatuer - in contest, should the game be important I'd raise my hand for an Arbieter to walk over if the opponent had meandered off. And then say politely "I adjust". Simply because your looking at your board and you don't know where your opponent has gone [edit] 😒. Thank you all for comments here on this thread🚬