Based on tax filings other users have posted on reddit, they are a profitable company, now their level of profitability is probably not enough to satisfy the venture capital they took though.
The issue here, with niche products you must interact with the community, you must listen to the users, you must have a good communications team to show the users what is commming, what your plans are, etc..
Remarkable does none of that, they act like they are apple, but they neither have the marketshare, the deep pockets, nor the cache that Apple does.
Hell I would be more than happy to donate cash to fund features but they do not even have a public roadmap, or uservoice, or any indicate they give a shit at all about what their users want.
hell one of the most basic features, 3 years running, has been custom templates. Which are literally just a PNG file background layer. No official support but several 3rd parties have filled this gap very well.
Remarkable is remarkably bad at customer service, and communications. Which is more likely to be their downfall than the subscription service. Niche product live and die by their community, remarkable ignores the owner community
One of the reasons I selected the SuperNote a5x as my target replacement if/when I need to replace my Remarkable is the fact that the developers of the SuperNote are very active in the community, on reddit, and publish roadmaps which they deliver on...