We know it isn't part of the deterrent as Apple simply doesn't do this: Apple does not now nor have they ever restricted the use of iMessage on either desktop M

We know it isn't part of the deterrent as Apple simply doesn't do this: Apple does not now nor have they ever restricted the use of iMessage on either desktop Macs -- whether their SIP is enabled or not -- nor on jailbroken iPhones. It is thereby nonsensical to look at Google implementing such a restriction and then say it makes sense because Apple manages to keep spam off their platform somehow... we know that is unrelated to how Apple pulls that off as Apple literally doesn't do this thing.