They've suddenly landed in a really controlling environment (be it a partner, parents, or a government), and wish to hide your relationship/keep you out of the crosshairs.
Artisian
Not FOSS, but ad free and its been able to find the hidden RSS feeds for things OK. FeedDemon at: http://bradsoft.com/
Probably not what you are after, but maybe someone with a similar question.
For me, actually put things in it, setup notifications for the day before (and on a device I actually see), add family, and check it before scheduling (some) things.
Make a New Year's Theme instead - CGP grey had a video on this. Then, when the first things you try related to the theme fail (or feel bad, or don't make sense anymore), pick something else in the theme and try that instead.
Productivity themed year got me to:
- Learn AutoHotkey
- Setup a central collection of notes
- Use a calendar app properly
- Finish several (profession related) books
- Track my internet time
and more! And, for maybe the first time, I finally feel like I did something with this whole resolution thing.
I've been using Memorix for years, and have no complaints. Light weight, backup and export features, color coding, repeatable reminders, and you can attach photos if needed. OTOH, not open source afaik.
The checking things off will persist though; for daily things that I want to repeat I manage them in the notifications tray instead of in the app.
On play store: https://play.google.com/store/apps/details?id=panama.android.notes&pcampaignid=web_share
It's likely in some cultural groups - and has been true for a friend or two of mine. A particular example was someone going to a Psych ward, where their phone was kept in a vault. Obviously you know more context than me. But the probability is nonzero.