It's a known matter! Coinbase made this clear in late 2018 itself that they will report the necessary information to IRS. Coinbase had created a dedicated tax resource center to help its clients to prepare for the tax season! You can access it from the below link,
https://help.coinbase.com/en/coinbase/taxes-reports-and-financial-services/taxes/coinbase-tax-resource-center.html?b_id=13521They also have partnered with TurboTax to provide tax service to its clients at a discounted rate.
You have to understand that, Coinbase is a legal business entity in US. So they are bound to comply with the tax rules and its amendments. There's no way out!
