@Richkm , For your questions, here are my answers:
Q1: What are the data collection point for Android and iOS device(not asking for windows ).
https://learn.microsoft.com/en-us/mem/intune/protect/privacy-data-collect#required-data
I found one above link is this application able for android and iOS practically.
A1: Yes, the link you find also apply to Andorid and iOS.
Q2: what are things or detail that Intune admin can check for BYOC and and Corporate devices from Intune admin side.
A2: For the detailed hardware information we can check in Intune portal with different platform, we can refer to the table in the following link:
https://learn.microsoft.com/en-us/mem/intune/remote-actions/device-inventory#hardware-device-details
Hope it can help.
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