Answer:
There are font size requirements on open end-products. Search the word "font" on these Reg Z pages, as examples, Appendix G of Section 12-1026-000 and
Appendix H of Section 12-1026-000
This last link refers to a font size in solicitations, which I assume is the advertisement requirements you are referring to. Otherwise, a generic ad wouldn't have a font size requirement.
Section 12-1026-005
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