Well, there we diverge, LOL.
Despite owning iPhones, most of my services (ecosystem) are with Google and Dropbox. I do use iMessage, but that's never been anything to draw or keep me with iOS. SMS/MMS/RCS are still plenty good for me. Of course, SMS/MMS is not secure like iMessage, but I am never discussing anything important or sensitive over iMessage. Anything like that is done in-person, face to face.
All of my email accounts are IMAP as well, so they are cross platform and I get the same thing on any device I use.
All of this is a direct result of trying to buy into Apple's ecosystem in 2012 with my iPhone 5, but Apple rejecting me because at the time my Macs were all PowerPC. I had to find workarounds to sync stuff between my PowerPC Macs and my iPhone 5. That was primarily Google. Dropbox comes in to play because it automatically backs up my camera roll.
As far as other Apple ecosystem features, there are either other ways of doing things or I'm just not interested. In any case, I eventually decided it wasn't good to put all my eggs in one basket. So when I finally did get Macs that could leverage the Apple ecosystem (through patching or OCLP), I continued to use the services I already use instead.
Basically, at any time, I could come and go between Android and Apple and not lose anything. I don't though, because while it isn't Apple's ecosystem that attracts me, it's iOS itself. And that only works on iDevices.