I think there is a difference between a very competitive league in which the title races go into the very last rounds between teams that are roughly on par, both in terms of quality as well as spending power, and a league in which a team wins the league 11 times in a row, most of them being more or less uncontested. I mean, just think about it from the perspective of a marketer: Advertising the match between Bayern and Dortmund between 2010 and 2012 or after Bayern signed Lewandowski, Götze and Hummels?
Regarding Serie A vs. Bundesliga, here are the Google Trends graphs for worldwide search volumes from 2004 until today:
Serie A began to outperform the Bundesliga clearly from 2020 (Juve's last title) onwards and the bundesliga only came somewhat close when Dortmund almost won the title in May 2023.