Reuters report:
[uk.reuters.com...]

Two quotes from the Reuters article below:

"The Commission said the guidelines require online platforms to identify the algorithmic parameters that determine ranking and to share them with companies".

"Smaller rivals and some companies have long complained about arbitrary and opaque practices tech giants employ that affect how their products and services are ranked in search results, especially when that means they are placed far below the bigger companies"

Looks significant if they enforce all they say.