If the app is made by a company that doesn't have its own analytics platform I would expect it's sending your information to at least 3 different sources.
Smaller apps might not do it at all, or maybe just one, but anything that's been around long enough will inevitably have up to about 5 different analytics platforms. It's the thing I feel the "ickiest" about being an iOS developer. I've successfully fought against putting in stuff like Session Replay (and Apple has since banned it) so that makes me feel a tiny bit better.
Smaller apps might not do it at all, or maybe just one, but anything that's been around long enough will inevitably have up to about 5 different analytics platforms. It's the thing I feel the "ickiest" about being an iOS developer. I've successfully fought against putting in stuff like Session Replay (and Apple has since banned it) so that makes me feel a tiny bit better.