I find that hilarious. The overrated calculator of all things is "proof again that is a different Microsoft that was a decade ago"

Microsoft is "different" for sure. Adverts in your OS (at least for now you have the option to switch it on or off.). Different. Sure! Opensource calculator.... uhm okay.
I can imagine the conversation went something like this:
"Okay brilliant money making team, we are getting too much attention for funding weapons and selling our clients privacy! People want open source! Let's do it! Any ideas? ............. Come now, not all at once"
/a hand slowly raises at the back
"Uhm, sir, uhm, uhm, what about, uhm, we make Paint.... **cough cough**... the calculator open source?"
"What calculator.... Oh! THE CALCULATOR! Brilliant! A bonus coming to you head of Advertorials and Other Intrusive Communications! Calculator opensource it is! Let's make Microsoft GREAT again!"