But it is written on the website: "without security compromise" - so it must be secure!!!

Also there is a lot of low contrast text on that website - this shows that they really know what they are doing and you can trust them. I am sure it is a very good company and you should give all the login credentials of your org to them and also install their binary on all servers.

Isn´t "trust in company" the reason why you are using Linux servers?