Just spam from the proton team, they really are notorious spammers. How could anyone trust a "privacy" company that does such shady marketing? Look at antics on Reddit for a primer sadly now on linux org even.
Mind elaborating a bit? This is the first time I'm hearing this. I thought their entire selling point was privacy and end-to-end encryption for emails.
That encryption is flimsy, they can (and do) break it for governments.
Apparently Protonmail have been cozying up to Trump as well. I've heard Tuta to be a good alternative I'm trying out. They are also encrypted but I think they also spam you with their "plans".
I'm four days later responding, but for what it's worth I find this source to be damning of email as a captured protocol, but meh on the implication that the Proton management is cozy to the Trump administration. Rather just clumsy in the quiet part out loud way.