You should note that most sports apps do not require legal compliance. However, for certain types of applications, especially betting apps, you must check the local laws and regulations in your target market and ensure that using such apps is legal in these regions. It is the best idea here to consult and share your ideas with an experienced sports mobile application development company. These companies hold expertise in app market research and will be able to determine whether or not your app idea will be compliant with your target market's local laws and regulations.