Companies fall under the government. So what a company harvests (to sell more toilet bowl cleaner), is accessible to the government it falls under.
By that logic, you should fear companies at least as much as their governments when handing them your data.
But companies have additional goals: to increase profit.
Which can be achieved by selling more toilet bowl cleaner. But also by externalising harm/pollution/costs, monopolising, reducing taxes, etc. All of which harm you, personally.
So, sure, worry about governments. But worry more about (big) companies. Read more history.
By that logic, you should fear companies at least as much as their governments when handing them your data.
But companies have additional goals: to increase profit. Which can be achieved by selling more toilet bowl cleaner. But also by externalising harm/pollution/costs, monopolising, reducing taxes, etc. All of which harm you, personally.
So, sure, worry about governments. But worry more about (big) companies. Read more history.