Note, if you have sensitive information in your signal profile, you shouldn't accept messages you aren't familiar with
See the "What happens when I ..." > "Accept" section
https://support.signal.org/hc/en-us/articles/360007459591-Signal-Profiles-and-Message-Requests
I'm not aware of any other privacy issues past that, but I'd worry about getting more spam by engaging with them
The black Friday page in particular
https://serverpartdeals.com/collections/black-friday-deals