"Even while using Lightning there are significant ways a third-party wallet service can fingerprint your information and collect it." Sure, like, if you send a Lightning Network payment through Coinbase, assume they have shared that payment with every government on earth. Fine, Coinbase discloses this in their T&C, that's what you are in for if you use Coinbase -- they don't try to pretend otherwise.
But Spark -- when you look at this page -- -- it looks like some kind of serious open-source protocol that Bitcoin people would take seriously and use, right?
Cyberpunk-like, self-custodial, all the good things. They don't say they "Oh, and by the way, all this fancy stuff requires that you hit our web servers and we'll keep track of every transaction and might give your data to the state of Israel if they ask for it." (or whatever.)
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