Streets of Rage is already available in the collection SEGA Forever
It’s free with ads, but also can be purchased.
All games collection SEGA Forever are available to download free of charge from the App Store for iPhone and iPad or Google Play Store for Android devices. The players who want to experience the games without ads can delete them all at once with the purchase of the game for 2,29 euros.
This version includes improvements from other titles in the collection, such as planks of records, stored in the cloud and support for commanders.