Only 50.9% of the homepages of the 10,000 most visited websites carry schema markup, the code that tells search engines and AI systems what a page is about, against 55.7% across all websites. And the types that describe a business in detail are rare: LocalBusiness markup appears on 5.2% of homepages.

Source: The Top 10,000 Websites Use Schema Markup Less Than the Web Overall: 50.9% vs 55.7% - Suff Digital