Apple doesn't mandate any other company to change something with their product (Apple installs mail, calendar, music on their own iPhone, iPad, etc). They aren't using their market position to coerce another company to do something in Apple's favor. (as far as Android vs. iOS and the associated hardware phones and tablets).
If you only look for one thing they got in trouble for. Other things include prioritizing their shopping results on their search engine. There are cases and rulings that don't have anything to do with "coerce another company" wrt monopoly laws. You can be in trouble for only putting your own products on your own products too, no other company has to be involved...just have to be large enough (by volume).
https://stratechery.com/2018/the-european-commission-versus-...
You don't get Google Play Services without a lot of terms and conditions, and without it you can't really be a useful Android product short of trying to replace the whole store like Amazon does to questionable degrees.
The issue is that Google uses blatantly illegal terms to force bundling of various apps upon other manufacturers, and this is illegal in both the US and the EU and most other jurisdictions.
This is a business-to-business issue, not a business-to-consumer issue. Hence why Apple putting it's own software on it's own hardware is not similar. (Also, Apple is not even approaching being a monopoly, Google already is one.)