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Article analysis:

The article is generally reliable and trustworthy as it provides a comprehensive overview of the current state of Uber and Lyft's ad businesses. It includes quotes from executives at both companies, as well as from an analyst at Bernstein Research, which adds credibility to the claims made in the article. The article also provides evidence for its claims by citing specific figures such as Uber's 80% year-on-year increase in active advertisers and Lyft's sevenfold increase in ad revenue quarter-on-quarter.

However, there are some potential biases that should be noted. For example, the article does not explore any counterarguments or present any opposing views on the topic of ride-hailing companies' ad businesses. Additionally, while it mentions other companies such as Walmart that are offering similar services to Uber and Lyft, it does not provide any information about how these services compare or contrast with those offered by the ride-hailing giants. Furthermore, while the article does mention possible risks associated with these services (such as targeted ads based on customer data), it does not go into detail about what those risks may be or how they can be mitigated. Finally, while the article does provide evidence for its claims (such as figures related to Uber's active advertisers), it does not provide any sources for this evidence or explain how it was obtained.