Earlier quoted context omitted.
I don’t think the Boomerang app is theirs. It doesn’t show up in the link of their Google Play apps. If it is, that’s Instagram’s trademark.
Apple allows “for X” and “powered by X” type app names per official policy cited by App Store reviewers There are other patterns they allow that I’m unfamiliar with. Perhaps “X Maker” is one of them because it appears there are many other developer accounts using this pattern from a quick search. The point is that using another trademark isn’t itself a violation necessarily
https://about.instagram.com/blog/announcements/introducing-b...
https://apps.apple.com/us/app/boomerang-video-maker/id145467...