Some of the things I have written down, are mostly old so if anything is missing or needs correction, please let me know:

They have shady origins, no one knows who they are or where they came from, but they did it with enough funds to quickly expand a large worldwide network of servers and an endless aggressive advertising campaign everywhere.

Misleading advertising, from saying they are the best in the world to adding countdowns to get an offer that restarts when clearing cookies.

They were hacked and tried to hide it for a very, very long time.

Their app on mac pings google every 20 seconds. The android app is riddled with trackers. They use a myriad of integrated google services.

They do not offer open source or audited apps.

If you cancel the auto-renewal of the service, you lose many secondary services and they charge you weeks before the end of the subscription.

In short, they are the kind of company that screams that they don't deserve anyone's trust, and that's a big problem for a VPN. I suggest mullvad, they have a long history of good practices, are privacy activists and are backed by companies like mozilla.