I genuinely don’t remember the exact instances we were speaking about, but it happens from time to team. They released data from a French citizen to Swiss & French authorities in the past, and I’m sure this isn’t the only case.
Edit: found the link: https://techcrunch.com/2021/09/06/protonmail-logged-ip-address-of-french-activist-after-order-by-swiss-authorities/
My theory is that Merz is looking to poach AfD voters, by “aligning” with their biggest point of immigration to strengthen his chancellor candidacy. But I’m also not THAT informed on the current events.