Let's say a person wanted to stay off grid. They decided they wanted to purchase their bitcoin -with cash-from a bitcoin atm and absorb the high premium as operating costs. Let's just say this person bought $5000 worth of bitcoin over time. Let's also say they used a non custodial wallet on a burner smartphone. Then, the price of bitcoin rose substantially. This person wanted to actualize their gains, but not for cash. They were good with gift cards from Bitrefill. So, using a protonmail account they purchased giftcards with their sweet gains and bought rich people food from whole foods.

To me, it seems to me this persons gains would be untraceable by a financial agency, as far as BTC is concerned. The weaklink in the system the wallet on the burner phone. This is less a bitcoin question, and more a tech question, but is it possible to get a burner smart phone and pay for data with cash- AND download a noncustodial wallet like blue or Muun without ever disclosing personal information to create an account and download these apps? And/Or, is it even possible for someone's wallet activity to be tracked by their phone? If I dowload Muun on my personal verizon serviced smartphone, can Apple track my wallet activity through my apple account?