They just blame it on their phone company and the like. I know a few people that knowingly hand out info at conventions yet will blame everything but. Might have to do with the marketing companies waiting long enough and people quickly forgetting about them entering their info. So when the spam calls hit they just think of whatever company they know for sure has it.

Side note: it’s almost impossible to book anything in Orlando without getting spamming with timeshare calls months later. I’m amazed it’s even legal.