The ads are in the free tier and the new ad-supported $8/month plan.
Every time this comes up there are comments assuming that ads are being injected into the normal plans, but these are for the free tier and the new Go plan which warns you that it includes ads when you sign up.
Every time this comes up there are comments assuming that ads are being injected into the normal plans, but these are for the free tier and the new Go plan which warns you that it includes ads when you sign up.