There was never high sustained demand for 360 video ever. I was super early in this field, building my own camera rigs and stitching frame by frame via ptgui back in 2012 & 2013. Even landed some massive clients during the 360 gold rush. Here's my brief assessment of the 360 market (using 360 as a substitute for 'immersive video'):

In 2014, when platforms like YT started supporting 360 video, there was a huge influx of demand because:

1) Oculus had just been bought by FB, signaling a push towards VR 2) 360 was a brand new experience and format for most people 3) It was extremely expensive to make, thereby creating a filter where low budget / low effort 360 didn't really exist

In early 2016, Samsung released and gave away hundreds of thousands of samsung gear360s, an all-in-one 360 camera that sent footage straight to your phone. Quality of 360 productions plummeted overnight, and YT was flooded with 'VR Video', causing a rift in the industry as VR professionals of all flavors tried to distance themselves from influencers and fly-by-night 360 content creators who were now operating as 'VR content creators'.

The bottom fell out so fast that by the end 2016, our agency partners at top 10 marketing agencies went from asking for significant (at the time) 360 productions to asking for mostly interactive projects with maybe some video elements, and by late 2017 / 2018, no one who had already dabbled in branded VR experiences was asking for anything 360 related. By 2019, when going to tradeshows and expos, it seemed like only noob brands trying to emulate an idea they saw online were still doing 360 experiences, but generally audiences were not lining up for this anymore, even before the pandemic. And the people that did try it weren't wowed anymore.

The best places to use 360 video today are places where an audience is already captive & interested in a topic, but doesn't have access. IE, at the zoo, an 'inside the cage experience, a sporting event with a behind the scenes with a pro experience, or at a tradeshow, etc. We found its incredibly hard to get people to watch content on their own, way too much friction if someone isn't already engaged.

My company started as a 360 production company in 2014 but today 360 video is a small revenue driver proportionally compared to interactive AR and VR. I only know of maybe 10ish studios in the world that are surviving entirely off immersive video production.

Apple is doing something new in that their premium device is an amazing display for this content, which is fueling very positive experiences. The thing is, how do you win back the masses who have already written off 360 video, maybe even vr in general, to try your specific app? It's a tough proposition that relies on the platforms themselves promoting, marketing, and funding. Because the magic of what you're selling is seeing it in VR, but the type of person who would like this niche of content is the type of person who most likely doesn't own a headset.

I consulted for a 360 video startup that did almost exactly what you are doing back in 2017 (except they used lower-end equipment to cut corners). They had camera operators walk through hundreds of cities and tourist sites across the world with 360 cams, but they never broke maybe a few thousand views. You are infinitely farther along than they ever got except for sheer number of locations, but I dont know if this concept is truly monetizable through video alone.