It is a coincidence. Legitimate operations are not spoofing their numbers in the first place, whereas spoofers have shown themselves to be dishonest by spoofing

It is a coincidence. Legitimate operations are not spoofing their numbers in the first place, whereas spoofers have shown themselves to be dishonest by spoofing. So you are not being removed from any spam lists using this method. Not only do they have zero incentive to remove you, they have also received a reliable indication that a human answers your phone.