This particular "story" was also another hit piece from anonymous "sources". We previously responded here:
https://www.reddit.com/r/ProtonVPN/comments/8ww4h2/protonvpn...But you don't have to just take our word on it. ProtonVPN in particularly has been heavily scrutinized, by both Mozilla (who we partnered with) and also the European Commission (which is providing funding): https://protonvpn.com/blog/is-protonvpn-trustworthy/
In other words, there are plenty of non-anonymous, legitimate third party sources, who have checked things out and confirmed the story is bogus.
One main allegation was that Proton shares an address with another company, but it fails to mention that our office in Vilnius is in a 30 story office building with hundreds of other companies: https://www.instagram.com/p/BxMz62oHb6K/