Dan either leaves HowdySEO, or sells Ruiz Plumbing.
He cancels with one click. It takes effect at the end of the month he's paid for. The free plan is offered, but he isn't pushed to take it.
The cancellation is confirmed in writing, with what happens next.
He downloads every change, report and his call history.
Within 2 business days he gets a written list of every login removed.
If he sells instead, he hands the account to the buyer. His obligation ends at the end of the paid month. Moving ownership of each account to the buyer is his own act at Google, his registrar and his carrier.
The buyer signs in with Google and accepts. The engagement and its history pass to him. If the house ever stops trading, every client gets the same cancel, export, login removal and deletion.