I created a google takeout and in that zip file I found some files containing a ton of data about me. It has logged every single page I visited while using the google search engine and chrome browser. It even logged every single time I opened an app on my old android phone. It even has VOICE RECORDINGS of me and a log of every time I used google assistant. This is just some of the data and I’m very sure there is even more data they have.
It’s not specifically gonna destroy your life but they could do things like: see what political sites/pages you visit, what you interact with on said site/page, what appeals to you. They do this for you and every other person using the service in x country. Use that data to package nefarious bills/politicians in ways you and many others find tolerable. This is just one way I could see them using you and everyone else’s data against you.
I hear this sentiment from many people I know “it’s just tik Tok bro, who cares if China knows every little thing about? They can’t do anything directly to me so they can have every shred of data they want”. Yeah, your data alone isn’t worth much, if anything. But when millions are all doing the same, there could be real consequence.