In this article you will be able to see the limitations of Audiense Insights if you are on a Free plan, or a Twitter Marketing plan. To have full access you must have the Audience Insights plan.
Main limitations:
Users with Free plan or Twitter Marketing plan can only create three sample insights report per month.
The report is based on a sample audience of 10,000 members:

The report is limited to generating only three segments:

In the Influencers Tab we only show the 15-20 top influencers, and the filters and custom rankings features are unavailable:


In the Media Affinity tab, under Social Media & Display Ads, and within the Actions menu, the ability to download targeting packs is unavailable. Additionally, you cannot send an audience to Connect.
Here is a full list of the differences and limitations between Free and paid Audience Insights: