They might be able to read from those relays. Your events are also propagated to other relays when users whose relays intersect with your own interact with them. But im far from an expert on this.

Also your npub is probably on nostr:npub1teawtzxh6y02cnp9jphxm2q8u6xxfx85nguwg6ftuksgjctvavvqnsgq5u and anyone could pick it up and add you as a follower.