In article , chris French
writes

Take more care to make sure you tick/untick the relevant 'do you want
this companies/other companies to sell you crap' boxes

The "marketing" people in general are not keen that "customers" should
have to opt-in to receive their junk. I'm sure it is complete
coincidence that a number of companies have started being a bit devious
in the way that they offer this choice.

Quite often I've noticed that there will be more than one tick box - eg,
"do you want to receive junk from us" and "do you want to receive junk
from others that we sell your details to". I've seen them worded such
that you have to tick one box to avoid junk and not tick the other to
avoid it. eg - "do you want to receive junk from us" and "do you not
want to receive junk from others".

They are banking on the fact that many won't actually read the words but
will assume that they need to tick both or untick both boxes.

--
regards andyw