Dude, listen. I am one person running a volunteer news project for free. I try my best to stay on top of researching the space, but there's no reasonable way for me to catch everything. I've written 200+ articles at this point, but due to a combination of factors, I struggle to get more than one article out per week at times. I regularly juggle a backlog of 40+ drafts at any given moment. Add a dash of burnout and fatigue, and you'll start to get a clearer picture: it's hard to keep up, and only getting harder.
There's no way for me to reasonably catch everything. Mitra's a cool project and all, but it's tiny enough that I've heard relatively little about it. There are dozens of projects out there at this point, and new ones everyday. If you're not advertising the thing you're building and what it does, there's a high chance I might miss it.
I keep an eye on the FEP developments from time to time, and I applaud all you've accomplished with that. However, the existence of a spec does not necessarily mean that platforms out there are necessarily implementing each and every one of them.
Most efforts haven't moved beyond the planning stages. Just because you can point to a plugin or a FEP spec doesn't mean that it's an ongoing active effort for bring a payment layer to the Fediverse, with a consumer-facing tool or platform. I'm sorry if I didn't catch that Mitra had some of that functionality, but I would also push back and say that the average person is not going to use Monero for payments on the Web anytime soon.
Those PeerTube plugins are nice, and the Premium Users one was actually something I pointed @quillmatiq@mastodon.social to for sub.club, as an example of prior art. They're interesting experiments, possibly useful integrations, but not in and of themselves actual platforms to build infrastructure and solutions on.