Will GTA VI cloud streaming be limited to Xbox consoles at launch?

I mostly play Netrunner at my local shop in Wichita, but our group also runs a weekly online game night, and a few of us are trying to plan around GTA VI next year. One thing I keep seeing mentioned online is that Xbox Cloud Gaming access for the game may only work through Xbox consoles at launch, which would leave people like me out if we mainly play on PC or a phone. I do not own an Xbox right now, so this matters for whether I should budget for one or just wait. I am not sure if that console-only wording is a firm restriction or just how the announcement was phrased, and I have not found a clear answer. Has anyone here followed this more closely and knows whether streaming will open up to other devices later, or should I assume a long wait?