What will the end of IDFA mean for some free analytics SDKs?

First, developers checked if marketing tools besides IDFA fall under Apple's definition of not-so-private For instance, initially many

Only apps that have permission to track you will be able to access your IDFA , after the change

idfa android IDFA 0:57 - Impact on marketers 1:15 - The future post-IDFA What does App Tracking

what is idfa IDFA number – but what does this really mean for in-app advertising? what is a user's IDFA? An IDFA is a