Don't make it personal. Make it relevant - When was the last time you liked being thought of as "a product"?
But this exactly how Google built its search business; by making us the product it monetises, rather than the algorithms it owns.
If the Product is free, then you are the product. But no one likes to be considered a product - that's way too much of a snub to our innate sense of indivdualism.
As Patrick Magoohan's Number 6 said in cult '60s TV show The Prisoner, ""I am not a number. I am a free man.."
This still resonates today. If we get too personal, we alienate people - that's obvious in any social situation. It becomes creepy and we become offended and turn off. Apply this to data and privacy in digital advertising and the result is the same: People turn away (install ad blockers).
But change the word and the sentiment changes too. Rather than being Personal, be Relevant. This change immediately de-sensitizes the "people-product" conundrum. Rather than being "up close and personal", or "in my face and creeping me out", the advertiser has now become more like a new friend providing serendipitous information (something I was looking for but didn't realise it at the time).