Which niches benefit the most from access to competitors’ ad accounts?

Hello

I’m doing some market research and would appreciate your input.

Hypothetically, if someone could get direct access to competitors’ ad accounts (for research purposes), allowing you to see:

- Active and past campaigns
- Creatives
- Ad spend behavior
- Scaling patterns

Which niches do you think would benefit the most from this?
For example:
- E-commerce
- Gambling / betting
- Crypto
- Dating
- Lead generation
- Mobile apps
- Affiliate marketing
- Local services

I’m not offering anything and not selling any service.
Just trying to understand where such access would be most valuable.

Any opinions are welcome.

Thanks.