Ads are dangerous, it can be used by hackers and scammers. It is better to avoid ads completely.
I don't think it's feasible to totally eliminate advertisements... Nearly all applications have advertisements, and the worst part is that even if you pay for a premium version to remove them, they will still appear. That is so f**king annoying.
There is a specific kind of advertising fraud called "Click Spamming/Click Flooding" that is exceedingly difficult to resist.
This variation targets mobile websites and applications particularly. The website or app conducts clicks in the background while continuing to function properly for the user. Because they never saw it, users are never even aware that they interacted with in-app advertisements.
Another is known as domain spoofing.
Fraudsters typically utilize this form of to pretend to be a high-value domain that is more valuable and more an asset. Although the user and impressions are genuine, the money invested on the subpar website is not justified. Cross-Domain Embedding, Custom Browsers, and Human Browsers are a few examples of domain spoofing. Examples of this scam include websites like Amazon that have been cloned; it will be difficult to detect this because when you buy goods, they will never be delivered, and Metamask is another example of website that can be cloned, when cloned it vanishes after you enter your log-in information.