It's running on existing T-mobile or ATT networks (MVNO), so they're not competing on building towers or anything. https://www.t-mobile.com/cell-phone-plans claims that tmo will give you unlimited everything for $70/mo for a single line. So what's Purism giving you?
EDIT: rereading it, it looks like the extra cost is giving you some privacy benefits and helping fund them.
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It's running on existing T-mobile or ATT networks (MVNO), so they're not competing on building towers or anything. https://www.t-mobile.com/cell-phone-plans claims that tmo will give you unlimited everything for $70/mo for a single line. So what's Purism giving you?
EDIT: rereading it, it looks like the extra cost is giving you some privacy benefits and helping fund them.