They do that because they want to force install their malicious apps in your phone and don't want you to remove them on purpose.Some of these telemetry apps even steals your surfing habits, data which you use daily and many of your personal inputs reporting them back to the manufacturers servers claimed for improvement purposes.

It actually work both ways.

Those ad blocker apps actually do you good but the content ad-tracking companies such as Google and Meta don't like you blocking their ads for loss of revenues. So they include those apps as illegal/security risks tools in their security patches.

Knowledgeable users of course know what they're doing, those ad-blocking/telemetry apps are not security risk apps but are revenue loss to Google/Meta.

But why do you think these corporations include them as illegal risky security apps under their security patches?