Google is testing not just large titles for grouped snippets but also large titles that are fully bolded for Google Ad results.
Here is a screen shot from Andrew Rodgers who shared this with me on Twitter:
Google is not bolding the title because it matches anything in the search query box. It is just bolding the title because it is testing a new look, I suspect.
I do not like bold things... :)
Forum discussion at Twitter.
It is not just ads I am told:
Not specific to Ads. Just the very top results. So applies to organic if there is not an ad there.
β //Andrew Rodgers β (@AndyNRodgers) July 10, 2020
Update in 2022: More bolding font tests:
Google is testing bolded font for me again on some browsers. #noOnecares pic.twitter.com/FD1CaIJSpQ
β Mordy Oberstein πΊπ¦ (@MordyOberstein) August 18, 2022
Update in 2023: More bolding:
Google SERP new font and bold π₯° #seo #serp #GoogleDoodle pic.twitter.com/Of79WOdy9Z
— Heba Said (@HebaSaidSEO) July 16, 2023