Indeed, advertising=screen.
You can also use https://mapcomplete.org/advertising and let MapComplete handle all the pesky tagging ;)
There are some who repurpose some Ikea-stuff as server racks: https://duckduckgo.com/?q=ikea+server+rack&iar=images&iax=images&ia=images&iai=https%3A%2F%2Fi.pinimg.com%2Foriginals%2F81%2F84%2Fab%2F8184ab11849051f4fa0f66f50b0ac97d.jpg
How can we make sure their privacy claims about search aren't bullshit?
(I still trust them though, just pointing out it is an equivalent problem)
Cool! I love the concept of Mobilizon, but the user experience has bitten me quite often. Gancio looks really nice!
Shoutout to https://f-droid.org/en/packages/deckers.thibault.aves.libre/, which shows your pictures on a map without any cloud service.
In Chiba city, it is described as "The sky above the port"
I'm gonna be giving a bit of contrarian advise here: don't force yourself. No-one asked you to do this all, so take it easy and one bit at a time. If you are a volunteer, just have some fun with it. When you don't feel like continuing anymore, don't.
Another piece of advice: "if you want to go fast, go alone; if you want to go far, go together". (But the latter is more work). If you live in a medium-sized (or bigger) city, maybe there are a few people interested in joining? Post to the local facebook group and do a small gathering with a cup of tea and map together.
Also a great option, but closed source
Because the northern hemisphere is mostly land mass and the southern hemisphere is mostly ocean. Land heats faster and cools faster than ocean, thus the seasonal effects are more pronounced in the data.
Same with CO2 patterns which gives a similar yearly 'breathing effect'