It might be only me, but never in my life I followed up on a growth hack email, be it manually crafted or AI-generated. If you want to sell me something and I didn't ask you first, I instantly become blind to the message and automatically send to spam without even registering, similar to Web popups. I'm constantly astonished that growth hack marketing has any conversion rate, evidently there's a chunk of population that's way more trusting than me.