What reasons would an ex use a fake account to follow every account that is following me?

Cut off a very egotistical ex who had very disturbing and disordered behaviour.

They called me 17 x in a row from a fake whatsapp. I've been blocking everything.

I recently started a new social account and yesterday, a new account followed me and went and followed every single account following me. Including accounts that are my other social media accounts.

I imagine its some sort of attention/surveillance thing. Do you think he's planning to message them embarrasing info?

What reasons would an ex use a fake account to follow every account that is following me?
What reasons would an ex use a fake account to follow every account that is following me?
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