John Mueller from Google provided suggestions for using Google Sites for SEO while downplaying the value of Google Sites for SEO.

Google Sites

With a signed-in Google account, you can create websites using Google Sites at sites.google.com/new.

Although one can choose to use a real domain name. The website is hosted by a free website builder and published under the sites.google.com domain.

Not Indexing Pages on Google Sites

Because their Google Sites webpages were not being indexed by Google, the person asking the query was concerned. The question was read out by John Mueller and is as follows:

"There was a question submitted in French, basically asking why my Google Sites website's pages aren't being properly indexed."

Google may index pages from Google Sites

John Mueller from Google was the first to confirm that URLs on Google Sites can be indexed.

Mueller's reply was:

"Getting questions in various languages is fantastic. Backing up, Google Sites-built websites can and do become indexed in Google Search.

However, because the URL you see when logged in and the public version can be altered. Google Sites' URLs can be a little tricky to track.

Spammers Like to Use Google Sites

Link spammers who use the "Google Stacking" strategy to build links on Google subdomains are well-known for using the Google Sites service.

A Google Site is used by spammers to construct a page of links on Google Sheets, Google Docs, etc., and then interlink them all. The erroneous notion that Google subdomains have "authority" and "trust". That is transmitted to spammer sites via links is the foundation of Google Stacking.

That's wishful thinking, of course. There isn't anything Google refers to as "trust" or "authority" that is passed from one website to another through links.

Suggested:

Google’s Guidelines For Paid Guest Posts.

Myths Regarding “Redirect Types” Are Dispelled by Google.