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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I believe Lemmy can be that alternative platform. For those unaware, Lemmy is very similar to Reddit, but it's ad-less, open-source, and user-run.
I'm not on iOS, so I can't personally vouch for it, but the official Lemmy website recommends Mlem, which is in open beta accessible through Test Flight.
Alternatively, Remmel should also be available on the app store.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.