Restaurant catalog promotion: subdomains

Question

Search Engine Optimization

Good afternoon. We are making a directory of establishments in the city N. There is an idea to put each establishment on a subdomain.
An excellent example of a directory: www.relax.by/cat/ent/restorans The
question arose: how does the main site communicate with establishments on subdomains?
In fact, it will be a large number of individual sites. That is, the site will have a large number of links to all subdomains. At the same time, from all these subdomains there will be a large number of links to the main domain. Will it be possible to get filtered for this?
And how to add all this to webmaster tools? Really each subdomain separately?? Or Yandex and google will figure out what's what?
For clarification: sitemap relax.by contains links to subdomains. Each subdomain has its own robots.txt. Some of the pages will be in normal form with unique texts (example: apple.relax.by ), and some will be almost empty (example: http://pitstop-korona.relax.by /, contacts only).

Answer 1

Do not do this)))
Do you yourself think that it is better to have 100 sites on 1 page or one site on 100 pages?
Do everything within the same domain and there will be a profit!

Answer 2

The subdomain theme works BUT only on infinitely trusted sites with an infinitely large directory and the same traffic. It's called "structuring".
In your case, the ban may not come, but there is no sense in hanging in the tail of the sickle.

Answer 3

how to promote this place? https://banketny-zal-v-goloseevo.ua.market/