I've never managed to find Roam's pricing. As most apps have a link to pricing right on the landing page, I take it as a bad sign when I don't see it.
The reason people are talking about Roam is because it's not like other note taking apps. People who use the app will need to extract a break-even $30 / month worth of ROI just like you might from any other piece of equipment or tool which extends your capabilities.
I find Roam compelling enough that I believe I can reach that point. If I'm not reaching that point, then I need to adjust my efforts.
I feel pricing shouldn't be a sticking point. I try to keep my consumption to a bare minimum, so that my focus is on high value activities. If the tooling can't return the investment, then that activity and the related tools aren't for me. It's not that the tooling is bad, it's just that my efforts are best pointed elsewhere.
I believe the founders operate on this idea and it's refreshing. Yes, it will be expensive for many. Potential users will walk based on the pricing. And I wish more developers would be willing to create something different and charge proper pricing for the effort.
I use OneNote since I already have O365 anyway. To convince me that I should pay more than 3 times what O365 costs, you'd have to be able to show amazing improvements, and Roam just doesn't.
Many founders do, and that's why they price themselves out of the market. That's simply not how people make purchase decisions. There are many, many products out there that are "worth more" than the price. If you think you can charge $30/month for a product because your customers will get $31/month worth of value from it, you won't have many customers.
I can't tell where "Roam Research" is based, or if it's even an actual company or just some developers using the name. There's no terms of service beyond their privacy policy, which doesn't list what jurisdiction they claim to be under.
I definitely wouldn't risk using the service based on the lack of information they provide.