How do some people post fake reviews on google?

There are several ways in which people can post fake reviews on Google:

Creating fake accounts: People can create fake Google accounts using false information and then use these accounts to post fake reviews.
Hiring people to post fake reviews: Some businesses or individuals may pay people to post fake positive reviews about their business or product.
Using review exchange groups: Some online groups exist where people agree to exchange reviews with one another, regardless of whether they have actually used the product or service in question.
Posting reviews from the same IP address: Google can detect if multiple reviews come from the same IP address, so some people use proxies or VPNs to make it appear as though their fake reviews are coming from different locations.

It is important to note that posting fake reviews violates Google's policies, and Google may take action against accounts that engage in this behavior, such as removing the reviews or suspending the account.

Your right, but so many reviews on google are fake. I know because I checked and have reported many of them to google but it takes so much of my time that i just give up doing it.

You are correct that there are unfortunately many fake reviews on Google, and it can be a time-consuming process to report them. However, it is important to report them to Google as they can harm both consumers and legitimate businesses.

To report a fake review on Google, you can follow these steps:

Go to the review in question on Google Maps or Google Search.
Click on the three vertical dots in the top right corner of the review.
Click on "Flag as inappropriate".
Follow the prompts to report the review to Google.

Google has a team dedicated to reviewing and removing fake reviews, so reporting them can help improve the overall quality of reviews on Google. It may take some time for Google to review the reported review and take appropriate action, but it is worth the effort to ensure that genuine reviews are given the attention they deserve.