Not specific to the CPG realm, but I've had some very good luck working with the OpenAPI-devtools Chrome Extension[1] (previous discussion here on hackernews[2]) to discover the underlying APIs of various sites that I want to scrape data from.
My knowledge on this is limited, and US-specific, but I'd imagine the situation in Europe is similar... In the US, publicly traded companies are subject to a lot of laws that private companies aren't subject to, most notably being required to make periodic public disclosures about finances and (to a more limited extent) business plans. Making false statements on these required disclosures is a crime, even if not intentional. The majority stakeholder might've done the math and realized that it's cheaper to buy out the other shareholders than it is to continue making those disclosures and risking criminal prosecution.
[1] https://github.com/AndrewWalsh/openapi-devtools
[2] https://news.ycombinator.com/item?id=38012032