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The agency claiming proprietary ownership of your account is standard shady practice where they built campaigns in their MCC not yours so they control the data… start fresh in a new account under your ownership and the historical data loss matters less than you think because Google’s learning phase only needs 30-50 conversions to optimize which takes 2-3 weeks at local service volumes.
Historical performance data is useful for benchmarking but algorithmic learning doesn’t transfer between accounts anyway so you’re rebuilding optimization either way… the bigger risk is letting that agency keep running ads in their account after you leave because they could tank performance out of spite or keep charging management fees while doing nothing, so cut access immediately and launch your own account with proper conversion tracking and budget controls from day one.
