Opt in Ads Beta Test

I read Brave browser was testing prepackaged ads in June:https://brave.com/brave-launches-user-trials-for-opt-in-ads/

4 questions:
Q1) Does this mean that the ads are fully downloaded locally and determined based on some local ranking system whether to embed them on the page?

Q2) Are the ads then prescreened by the brave team and thus there is no real “real-time” ad serving component.

Q3)What will be the storage requirements for the ads or will they include little to know media content?

Q4) Any issues or feedback received with the beta test?

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