There are tools out there that use reverse IP lookup and open-source intelligence to allow a webmaster to automatically identify the person (including name, email address and phone number), along with their company of any visitor who was on your website in real time.
The visitor doesn't have to submit anything – no contact form, nothing.
This then allows the marketing team of a company to immediately reach out to the visitor on the website, and ask if they need anything/need assistance.
I find this so unethical, yet apparently this isn't breaching GDPR laws?!
How would you feel if you were visiting a website and you received a phone call from that website, asking if you needed help?