Erase.bg is an incredibly simple background remover tool that was first created for companies to use for e-commerce projects. But it’s also available for free to use for anyone. You can use the iPhone or Android app, or you can use it directly on their website.
I tested it on iOS with two images, and it did an excellent job. It's worth noting too that the developer has state don on the Apple app store that no data is being collected from users.
See This Free App Removes Any Photo Background
You can get rid of photo backgrounds without ads, watermarks, or in-app purchases.