Greg isn't the only person who owns MF, there are people like Nippard who call it (my app and are either shareholder or promoter with a lot of influence), if you look at the whole hussein and julian fiasco and solomon nelson episode well...

This is kinda misleading. First of all, MacroFactor uses the Gemini API for photo to calorie/macro estimation, so the data does leave their premises. It does not work completely offline, so it does call home, and after that, you never really know what happens with the data.

MacroFactor charges roughly $70 a year. MacroCodex is free and doesn't require an internet connection to work. It can also offset random weight gain due to PMS or other short term hormonal cyclical issues, as well as other water retention issues. It doesn't even ask for your phone number or email or even date of birth!! (it just asks age) on Android. On the web app, an email is required only for storing your data (due to the volatile web storage offered in PWAs, where the OS/browser can evict storage under memory pressure).

If an app doesn't collect your personal identifiable data it cannot sell it, if it's capable of running offline it can be put behind a firewall rule and/or diagnostic/telemetry data disabled in setting though i'd argue if it's not collecting your personal info and want data for improvement of specific app feature (which benefit from data analysis) then you should perhaps analyze the risk of this decision.