From the Florida Action Committee:
On April 19, 2018, Facebook owned Instagram, revised its Terms of Use.The new version replaces the prior version, which had been in place since 2013, can be found here: http://help.instagram.com/581066165581870?helpref=page_content
Sadly, included in this months change is a ban on anyone registered as a sex offender. The restriction did not appear in the prior version.
A comprehensive online news search revealed no issues with sex offenders using the platform in the past.