What if aggregateRating is made fake?

Question

Search Engine Optimization

Good day everyone,
Now I am creating a site and doing it on schema.org
There were 2 questions and I am very surprised why there is no information on this issue anywhere on the Internet.
1) What is aggregateRating, which displays 5 stars as a page rating, set by itself without real user voting? Thus, always put a 4-5 rating.

<meta itemprop="bestRating" content="5">
<meta itemprop="ratingValue" content="4.8">
<meta itemprop="ratingCount" content="20">

It is clear that you can also write a script on the site that every N days increases the number of votes by 1 and sets a random value according to the written algorithm in the range of 4-5 points (with a maximum score of 5, for example).
It is also possible to pretend to make a fake vote supposedly sending ajax requests.
2) How does Google decide whether or not to display stars in the search, even if schema.org with aggregateRating is on the site?
I found an example for the query "spartacus blood and sand watch online", where there are no stars in the search results, but the rating is on the site. Website kinogo.by/3576-smotret-onlayn-serial-spartak-krov-i-pesok-1-2-3-season.html

Answer 1

1) it works, it’s checked, you don’t even have to update the number of votes and don’t provide users with the ability to vote
2) probably no one except Google representatives can know this