Didn't I hear that this was false? Maybe its deleted from your device but not their servers
I tried using Snapchat once and as a privacy conscious person, it felt more like spyware than an actual program. So many dark patterns and automatic turning on of cameras. I shared as little data as I could and I still got recommended family members.
TL;DR: DO NOT USE SNAPCHAT
That is not why people use Snapchat, it's for privacy from other people, not privacy from the corporation itself.