What are the open data sources for reporting on advertising campaigns on the Internet?

Question

API

Hello! The task is next. There are tables with statistics on advertising campaigns (Google Ads, Google Analytics, Yandex Direct, Yandex Metrica, FB, VK, MyTarget). They need to be enriched with data from open sources, so that this will help to conduct the RC more effectively. Ideally, this is sales data, such as real estate. I understand that few people share sales data, but still. And you can also use any data that will help you make more interesting reports in Power BI. It can be obtained via API or in the form of ready-made tables / databases. The question is general, but maybe in the process of discussion we will understand in which direction to move. Thanks in advance.