Is it good that the network of sites repeats the main page of the promoted site?

Question

Search Engine Optimization

Hello,
There are N-domains I have idle. People sometimes visit them.
There is also 1 project that I am promoting.
What if: place a copy of the main page of the promoted project on each domain. those. people go to the sites and see the project page, follow the link and get to the project... how will the search engines react to this?

Answer 1

Search engines will react badly to this, it will not be a unique project. Plus it can damage your main site. Better use unique content on other domains

Answer 2

for N-domains, it is better to use a page with various descriptions of your services, projects, etc.