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Well, it might be a coincidence, but it also wouldn't surprise me if it wasn't. Your identity was probably linked using fingerprinting. Private browsing mode offers almost zero protection against this. Even Tor isn't protected unless you enable the Safest security level (= completely disable JavaScript). This might even be done through multiple levels of indirection (mobile browser fingerprint -> Google account -> desktop browser fingerprint).

If you can reliably recreate this, then you may be on to something interesting. I couldn't guess what.

Otherwise, the most likely answer is coincidence.

that's the usual targeting we know and love since early 2000s. we are talking about something worse.

IP address? Or coincidence?