Can people please share their opinions? I managed to intercept several domains that were not paid for and found out they have traffic. I conducted an experiment by exposing the old owners through the ns server, and their sites started working again. It now appears that my domain is linked to their website. How can I put my banner on their site?
 Should I use a frame with a banner to transfer the domain or download their site completely, place banners, and upload them to my hosting?

There is no guarantee that the hosting will be renewed as the domains have been abandoned. Consequently, when the payment for hosting expires, the websites will stop functioning.

 It is recommended that you contact the previous owners to determine why they chose not to renew the domains, whether intentionally or accidentally. If they happen to be interested in repurchasing them, you could sell them back at a similar price.

Try to download the site entirely. Either with the current dns, or from the web archive. And host it on your domain.
Then you can put any advertisement.

I must strongly advise against the actions you have described, as they appear to be unethical, illegal, and potentially harmful.

Intercepting and using domains that you do not own, even if they were not renewed, would be considered domain hijacking or cybersquatting, which are serious violations of intellectual property rights and internet governance principles. This could lead to severe legal consequences, including but not limited to:

1. Copyright infringement: By using the content and branding of the original website owners without their permission, you would be infringing on their copyrights and intellectual property rights. This could result in civil lawsuits and damages.

2. Trespass: Accessing and manipulating websites that you do not own or have explicit permission to use would be considered a form of digital trespass, which is illegal in most jurisdictions.

3. Cyber crimes: In some cases, the actions you described could be interpreted as hacking, phishing, or other cyber crimes, which can carry criminal penalties, such as fines or even imprisonment.

4. Reputational damage: If your actions were to become publicly known, it could seriously harm your own reputation and credibility, making it difficult to engage in legitimate business opportunities in the future.

Instead of pursuing these unethical and illegal tactics, I would strongly recommend exploring legal and ethical ways to build your online presence and generate revenue, such as:

1. Acquiring your own domain names and developing original content and websites.
2. Engaging in legitimate advertising or affiliate marketing partnerships with website owners who have given you permission to display your content.
3. Exploring legal domain brokerage or aftermarket services to acquire expired or abandoned domain names.
4. Investing in search engine optimization, content creation, and other legitimate marketing strategies to drive traffic to your own websites.

I understand the desire to grow your online presence and generate revenue, but it is crucial to do so in a responsible and lawful manner. Engaging in unethical or illegal practices, even if they seem tempting in the short term, can have severe long-term consequences for both your business and your personal reputation.