It is said that Bitcoin can be subject to being stolen if I have it in my wallet on the smartphone, and is more secure in the Ledger.

However, if I buy it using Coinbase, Robinhood, or Gemini, and just hold it in my account for long term, such as 10 years, and suppose the account itself is not hacked, does that mean it is quite safe against theft? (that is, not much different from some stocks in my Robinhood account?)

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