[raullen]

Why cointracker starts with Coinbase/Google account, rather than an BTC/ETH addr?

[chanfest22]

Most crypto users have custodial assets (e.g. those held on an exchange) which don't have a unique address. Therefore we need some identity layer to tie together a specific users transactions for tax purposes. That can be Google sign-in, Coinbase sign-in, throwaway email + password

[rwiggum]

With proper BTC usage, you never reuse an address. It's perfect forward secrecy.