It says all that in the article.
a little snippet of the article can help reduce the number of people who have a knee-jerk reaction to whatever the headline says
For readers who do not want to pay to read the article, the headline leaves incomplete context and creates a misleading impression of the story. That damages Proton’s reputation, and the missing context is only available if someone pays for the article, reaches out to Proton, or searches forums for substantive information.