For my employer's Corporate Amex (Green) card application., its a documented part of the process and required by all applications for the card. Not random or periodic. But that is different to the OP's need for verification for a supplementary card.
In some instances, yes, but it's mostly irrational paranoia, for eg, he didn't collect the Vic gov $250 for energy comparisons on either of his two properties because he didn't want to give them his details. Interestingly for this card, I ended up getting the supp in the name of my mother instead, who died in 2020, without any request for DL etc from Amex.
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