I'm not still not sure whether this is either a) a joke b) a cultural difference in what's 'acceptable' quackery or c) you're just very uninformed.

I'll give you the benefit of the doubt and opt for c).
Sorry to pop your bubble, but your startup is not going to work out in the current form.
All I see from your website, is a company founded by three students who read some papers about EEG and want to sell me a treatment for ADHD and depression using home made beta software and a consumer grade! EEG headset.

At least in my book, this is flat out quackery and one of the reason that Neurofeedback is still seen in many places as 'alternative medicine' and does not have a stellar reputation although it has been shown as effective in a couple clinical trials.

First of all don't even try to conduct a survey on treatment efficacies to make up for missing data on your own website. Please leave this to clinical trials.

Second, you compare your pricing model with allegedly professional Neurofeedback providers, by actually not offering any in-person session and non-medical EEG devices? Is this really not a joke?

Let's just ignore for now the fact that consumer grade EEG headsets don't even offer the precision you need for proper Neurofeedback training.
e.g. Emotiv epoc offers 14 channels@128Hz, where real EEG hardware usually has at least twice the sampling rate, a greater bandwidth, and 19-21 channels (up to 256 in research).

Most importantly, how do you even think your treatment works? You can't just look for any occurrences of "slow-wave power" and then tell your patient that he should pay more attention now.
That's not how any of this works.

You need to identify signal signatures in response to standardized stimuli. In patients and "healthy" controls. You need to account for the whole spectrum of any mental disorder. Even though they are usually defined as in the DSM as "one disorder" with couple of symptoms, on the individual level there is not much commonality left among all the people with the "same disorder". So you need to "reassemble" the disorder bottom-up, by clustering different sub-types based on biological markers (EEG profiles). Then you got to match them to their clinical diagnosis. If you have any meaningful data left by then, you might be able to identify a small set of markers that exhibit a high predictability, that a given patient belongs to a presumed subtype. Existing commercial databases are of the order of 1K-4K healthy controls and hundreds of patients.
Then you can start a training using those markers. Now comes the fun part of assessing the clinical efficacy of your new marker set. You'll get a whole bunch of sub-types like high frontal delta/low dorsal alpha/low beta, high alpha/low beta, or low theta/high dorsal alpha/"higher" frontal beta, etc. ...
each of which has to be trained accordingly.

I really don't see how you want to recreate all of this on consumer EEG hardware. And if you opt for the current medical hard&software/databases: then what's your value proposition? How do you want to beat current model, of a licensed practitioner guided by a supervisory psychologist? Because this setup gives you the efficacy of the literature and it costs a hell lot of money.

Please don't sell any "treatment" that you can't provide. I can understand that it is a very tempting and huge market: "According to the CDC one in five Americans have ADHD, anxiety, or depression.", if you really want to make money there, go to big pharma, if you actually want to "cure it", go to research. But I really don't think, that selling this quackery is going to benefit anyone.

disclaimer: this is neither my field, nor do I have any stakes in that particular game, just happen to know some people doing actual research on this matter.