There are two websites with guest reviews and both of them highly ranked on Google.
The website no1 has 20,000 indexed pages where the web no2 (ranked first on Google) has a 100,000 indexed pages (70% of them are guest reviews).
Each review is saved automatically as a separate html page. You see a list of reviews under hotel listing but Google sees them as separate pages.
In this way, the number of pages for website no2 grows about 3000 pages per month (daily 100 new reviews) so they can increase their indexability and visibility on SE.

Is there any SEO advantage of this “system” except growing number of indexed pages? Maybe some disadvantages ?