I'm confused.. it was unlimited before? I received an email saying my google drive quota (16.5 of 17gb) was reaching its limits and I needed to buy google one t

I'm confused.. it was unlimited before? I received an email saying my google drive quota (16.5 of 17gb) was reaching its limits and I needed to buy google one to go over that. It looked like Photos was taking up the most space and I assumed that was included in the google drive cap. Did they just get me to sign up earlier than I needed to?