At a glance, it’s not clear what is an okay domain and what is suspicious. They can be used for a number of different tasks, including the basic functions of a site or app, analytics, advertising and marketing, attribution trackers (so an app knows where a referral came from), or more malicious tracking and data collection. If you’re curious, you can try looking up individual domains you see by doing an online search with the name in quotation marks, or doing a domain name search to see who owns it. If all else fails and you’re still curious, you can try emailing the app maker or website and asking.
