You know what really grinds my gears? Products that have no right of linking your data to an online platform.

Case and point: Password Managers. Nearly all of them work only with an account on a given service, have the passwords stored on their servers and so on and so forth. There is 0 transparency and for that matter 0 security. I found my choice, though it infuriates me terribly.

Another thing are budget managers. The switch for YNAB from local to on servers really annoys me. They should have no business in storing my very private data on their server. I don't understand people using it either.