It's not uncommon for you to find a webpage with a list of people's biography and links to their social media accounts, including Instagram. Most of the time this is on a "Team's page" for a Startup or Agency, but also on pages that list speakers at an event, or even those magazines listicles ("Top 50 Female Athletes in the US").
One way for you to follow all of those accounts is to go through each one of them and follow the link to Instagram, click follow, and repeat it 50 times. Who has time for that? With Listpedia you can create a list by simply having a link to a webpage.
If you want to start a new Instagram List from a link:
Listpedia will automatically collect all the accounts that it can find on that page and add it to your new list. At this point, you might want to review the accounts to make sure those are correct. Often, the website's main account is also found on its footer and it's added to the list.
A little bit of warning, since this might not work for all websites. Many of them, use some web rendering technology that prevents this type of scraping.