From a technical perspective, there's nothing different between the 3090 and the 3080 that is for commercial use only. The 3090 is not a quadro part. Sure, they may have killed the "Commercial" Titan and replaced it with the 3090, but the card is a gaming card. I also think that 24GB of memory is going to come in handy very soon and people with early 3080's will wish they had more.
Marketing Answer - Yes the 3090 is a multi-market card because of it's extreme power.
Technical Answer - The 3090 is just a faster 3080 with more memory. It's not a Quadro and it should be marketed and used in both gaming and some commercial applications, which is exactly what Nvidia is doing. The other reason they're changing things with the 3090 is because of the price. The Titan price was out of reach for the gaming market for the most part and made little sense to purchase just for gaming. The 3090 is priced right for crazy top end gaming. The 3090 is the top end of gaming, not the 3080.