Custom properties have the following usage limits:
Maximum of 100 custom properties per file, totaled from all sources.
Maximum of 30 public properties per file, totaled from all sources.
Maximum of 30 private properties per file from any one application.
Maximum of 124 bytes size per property (including both key and value) string in UTF-8 encoding. For example, a property with a key that is ten characters long can only have 114 characters in the value. A property that requires 100 characters for the value can use up to 24 characters for the key.
Writing a file property has the same performance implications as other write operations.
What is a Google Drive Stack? Google Drive is a free and paid product that Google offers in order to support people and businesses with products like Documents, Slides, Forms, and much more. All of those documents are then stored in the user's Google Drive. Users can then publically (or privately) share each or all of the contents of a Googe Drive, and best of all, they can even be indexed and ranked in Google search.
From an SEO perspective, using Google Drive Stacks leverages the power of the Google domain and trust in order to promote your website both from an increased rankings perspective, as well as from having additional ranking properties in the search results.
You can use stacks to test new markets, test competition, or get the rankings boost without resorting to PBN's in most markets assuming your on page optimization was done well.
Will Google Drive Stacks Get Me Into Trouble With Google
Today no it won't, however, let’s be honest here Google may take issue with it all in a couple years, we just don't know.
That said, Google Sites was built to embed the properties in your Google Drive and act as a hub for your business with Documents, Slides, and much more. They want you to leverage it.
And it's reasonable to expect that any good business has a hub like a public Google Drive to share information, edit content, develop sales strategies etc.
In the end, this is like any other tactic to promote your website, as long as you don't abuse it you'll be just fine.
Our local authority stacks are a strategy we use to effectively power up Google My Business listings, these are pure link and relevancy funnels that can quickly propel a listing up the local SERPs.