iMessage is nowhere near as popular outside the US, mostly because consumers do not expect to default themselves into some kind of single-manufacturer proprietary "ecosystem" that rivals Sony in how anti-consumer it is.
Thanks to the EU, you can just charge newer model iPhones with any USB-C cable now instead of having to pad Apple's profits further with proprietary dongles and cables that offer no additional value.
Your depiction of iMessage (which is essentially SMS+encrypted communication with enhancements to people who also have Apple devices) seems disingenuous, as does your explanation of why people use alternatives outside the US. Outside the HN bubble, most people don‘t care about things like proprietary vs open (and if they did, why the heck would they opt for propietary alternatives).
Thanks to the EU, you can just charge newer model iPhones with any USB-C cable now instead of having to pad Apple's profits further with proprietary dongles and cables that offer no additional value.