No, the Fonts team can’t read or access any user texts. We take your privacy extremely seriously, and only retain some information related to how you use Fonts keyboard, such as how often you use a specific font. Furthermore, we acquire the characters typed on the Fonts keyboard to develop our auto-correction and word-suggestion service, but the acquired data isn’t linked in any way to the identity of the user who typed it. Any and all such information acquired is fully anonymized.
We also don't have access to the characters you enter on other keyboards.