Alias Domain SEO Impact

Question

I am a bit afraid that google will punish us as of duplicate content. Let's say there are three domains.

service_a.example
service_b.example
mycompany.example

All three domains shall share the same Colors/Styles/CI, so I want to have all sources in one place. If I change the button color, all three domains should update.

Idea: mycompany.example is the main domain which has a path /service_a and /service_b. I want to configure NGINX that way that if a user visits service_a.example the content of mycompany.example/service_a gets served. My idea is just to add a canonical link from https://service_a.example to https://mycompany.com/service_a.

See also What is duplicate content and how can I avoid being penalized for it on my site?: Google doesn't usually punish for duplicate content, it usually chooses to ignore all but one of the duplicates. — Stephen Ostermiller, Apr 23 '20 at 22:09
Another relevant question: What should I do with a ton of alternate domains? Redirect or use landing pages? — Stephen Ostermiller, Apr 23 '20 at 22:10
The difference here is that I don't want to redirect. If the user finds us via paid ads because he is looking for service_a, I don't want to redirect to mycompany.example because it would confuse the visitor maybe.
I'd rather leave him on service_a.example. As soon as we sold something to the client I want to tell him that under my company.example he will find all our services.

I don't want to get more SEO traffic, I just don't want to get punished from google if I have three domains and two of them have a canonical link to the primary one. — Simon Ludwig, Apr 23 '20 at 22:57
That is why the question about duplicate content is relevant. Google almost never "punishes" for it. — Stephen Ostermiller, Apr 23 '20 at 23:04
Ok got it, just read the two other links. My fault. "If your site must return the same content under multiple URLs (e.g. for a "print view" page) specify a canonical URL manually with a link element in the document header". So my approach should not have any bad impact on my domain my company.example. Thank you very much. — Simon Ludwig, Apr 23 '20 at 23:08

Alias Domain SEO Impact

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