Probably "number of users who were active this month" for monthly, versus "number of users who were active the last half year (6 mo)" for halfyear. Both can be updated monthly. A user who was active 3 months ago would be in the second group but not the first.

Lemmy join the ride!

Here, fixed it for you so the analogies to the apple example are not completely wrong:

"Cars should have more seatbelts!" "Yet you buy from brand X who refuses to provide belts and lobbies against belts, you could buy Y instead!"

"We should improve our society. (Said by a rich provileged person)" "Yet you don't push back against horrible practices, just talk a bit and otherwise enjoy your privilege."

Cue* ;)

No need to downgrade python, and no weird dance shoukd be needed. Use virtual environments! Conda is great if it's your first dabbbling with virtualenvs. What other things are blicking you?