Things I have found:
Coinbase partnered with TurboTax to save you $15 - "We’ve partnered with TurboTax to save you $15 on TurboTax Premier, which easily handles cryptocurrency gains/losses." They are not doing anything to usably, actually, track your transactions.
Coinbase is only pushing registration at CoinTracker - "For the 2020 tax year, Coinbase customers can get a discount to TurboTax products using this link or take advantage of CoinTracker to determine their gains/losses." - Since you have to connect the CoinTracker account to your CoinBase account it would be a sure bet that CoinBase is getting a hefty "Referral Fee" for you signing up at CoinTracker as the "Plans" are incredibly expensive for really nothing more than downloading your transactions. But, of course, this takes the heat off of CoinBase as they will say they have nothing to do with the costs of getting your information.
