Why alerts matter more than they sound
An autobuyer is meant to be left alone, which is exactly why you need telling when something happens. The two moments that matter are the good one, a card bought under its price, and the bad one, the run stopping. Without alerts you find out about both by going back and looking, which rather defeats the point.
The messages are deliberately short. A tick, the player, the price. Skimming a channel later tells you what a session actually did, and a run of crosses tells you your price is set too close to the market and other people are getting there first.
Alerts that mean stop what you are doing
A captcha alert is the one to act on. EA wants to see a human, the run has already ended, and the sooner you solve it the sooner you can start again. A soft ban alert means your searches are being throttled, and the right response is to leave it alone for a while: our guide on the transfer market soft ban explains how long that usually takes.
What gets sent
Only the message itself: the card, the price, the reason a run stopped. No account details, nothing about your club, and nothing at all unless you have pasted in a webhook URL. The privacy policy has the full detail, and the rest of the controls are covered on the safety page.