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If you think trusted third parties are security holes, corporate hardware wallets also have to fall into that category.
IMHO, it's just tradeoffs all the way down.
Nostr having a vibrant ecosystem of different clients wonβt just make all of them better via competition, it also allows us to choose the client that is the best fit for us personally. Unless Twitter re-enables APIs, they simply can't compete in this way.
Not sure who needs to hear this but... you don't have to enter into a trust relationship with a company to have secure bitcoin cold storage. All of the tools you need to independently & conveniently create & manage offline keys to secure your stack are out there, and they are accessible to people of modest technical ability. This hasn't always been the case, but I'm extremely thankful that we've arrived at a place where its possible.