Google spreadsheet read limit

I’m using Google spreadsheet for my database and I’m using the share link to read the data in it and I’m exporting the spreadsheet to csv and reading it but I have a question… How many people can access the database at a time?

Google Sheets API has a limit of 500 requests per 100 seconds per project, and 100 requests per 100 seconds per user. Limits for reads and writes are tracked separately. (There is no daily usage limit)
You can request for increasing limit.