ABP is the pension fund for, among others, the Dutch government. I don't think they'll openly call Elon Hitler all that quick, just to keep up good relations.
I've had postmix based energy drink in the Netherlands, so that's not true. Ingredients are not held to the same standards as premixed drinks.
To answer op's question, I think it's more of a supply/demand case, and a postmix doesn't display the brand as well as a can of an energy drink does (which is also marketing).
The CEO made a remark about Trump, and used his corporate account for it.
If I recall correctly (no press statement was made by Proton), it was a personal remark on a corporate account, which he was quick to allow anyone to do. It also didn't support Trump as a whole, just a remark Orangeman made about getting small business a level playing field (which I totally trust from an olicharch).
I'm still sticking with Proton for the foreseeable future, as its privacy awareness and advocacy is still a core business value.
Luckily just six members, so far