Now imagine that account was linked to a SIM. It's trivial for a nefarious actor to get it re-activated, infact there was a video by Veritasium just today where they didn't even need your SIM.
But even if they are not that hi-tech, it's not that hard to get a SIM issued in your name, or other hacks of a similar nature, we have all heard of stories.
Worse, you lost that SIM a decade back, the number gets back into the queue, and is eventually re-issued to someone new... and they try to create a facebook account, and are presented with yours.
They can then re-activate your old facebook account, and post a video/audio/text of "godelski" saying they like pineapple on pizza. and before you can defend yourself, the pizzarias have lynched you.
(I dare not use a real example even as a jest, I live here)
Are you 100% sure of all your old social media accounts, all the SIM you have ever used to log-in to accounts?
We leave a long trail.