Proton Mail encrypts the content of the mails, not the subject. So even if it is a Proton Mail-to-Proton Mail conversation the subject is not encrypted. Skiff also encrypts the subject of the mail in a Skiff-to-skiff conversation.

I said this in Reddit, I will say it here too.

"Well,

(Note: Most of my family and friends don't really care about privacy.)

So, it’s kiiiiinda about my privacy, since I do NOT feel comfortable using a Meta product.

Because most of my family have FB, FB Messenger, IG and/or (well, of course) WA."

+I want to increase their privacy and security as well.

Well uhhh, kinda late, but the “original” openboard project hasn’t got an update in like, 12 months. There are forks, though.

Fork with glide typing - Haven’t received an update in 11 months https://github.com/erkserkserks/openboard

“New” fork: https://github.com/Helium314/openboard

OpenBoard, Florisboard, AnySoftKeyboard

THERE ARE ALTERNATIVES, PEOPLE!

Well, Mull is more like a “Librewolf for Android”, I (think) it is more privacy-focused than Fennec.
Mull also supports more extensions from developer options.

Check these out for Librewolf and Mull’s results. Fennec isn’t in the list (yet?)
https://privacytests.org/
https://privacytests.org/android.html