Model deprecations, price changes, and product sunsets are routine. What you actually lose depends entirely on which side of the boundary your agent's memory and configuration live.
An honest comparison of a sovereign AI agent and a hosted cloud AI assistant: what each one owns, what each one costs you, and when the rented option is the right call.
The phrase sovereign AI usually means state-controlled models and compute. The same idea applies at the scale of one person, and that is what a sovereign AI agent is.