How can I defend myself from someone who knows how to dox and exploit app vulnerabilities?

A while ago I had a confrontation with a guy who knows a lot about doxing, also, he knew how to steal and suspend IG, Twitter, Telegram and Facebook accounts, and WhatsApp numbers. It also created modified versions of WhatsApp so that they could be used to send messages that saturated the WhatsApp of a person who used the normal application (here we call them binary messages), it had many virtual numbers so it was impossible to do anything to …

accounts app app vulnerabilities doxing exploit facebook lot numbers privacy steal telegram twitter vulnerabilities whatsapp