This is not any promo. I just found a Blogspot blog (subdomain) ranking very well on Google. https://javarevisited.blogspot.com/
Secondly, thehackernews.com is also a blogger blog which is ranking high but I couldn’t find their CMS as a blogger in cms checkers.
If you find some blogger blogs that are ranking well, please post here. It may help new bloggers who just started their blog on the blogger platform.