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That’s what I said about Halide, before they moved it to a subscription model.

You must be confusing Halide with Filmic Pro.

I think they're talking about this, from Halide's page in the App Store:

In-App Purchases Yearly $11.99 Monthly $2.99 One Time Purchase $59.99

Only for new features right?

Yeah and you can still buy it for a one time $60 purchase if you want.