May I ask how many citizens have a availed themselves of this pseudonym service? I wasn't aware that was a thing we were doing.
This practice came in as a result of the Sebastian Penache case. The courts final ruling on that was very weird, as you probably remember. So, rather than allow that to ever happen again and to happen without us knowing about it, Interior allows the practice, but now demands (under Pete Townsend) that an applicant provide a method for us to verify their legal name. This allows folk to continue their 'incognito' statuses for whatever reason, but ensures that we still know who they are.
This is the middle ground compromise. We either have it be completely open with little to no protection on things like electoral fraud or from sock puppets and Guy Incognitos or we go whole hog in the other direction and have a strict 'real name only' rule, but to truly enforce that we would need a strict ID card requirement. I think this compromise works better than those two extremes.
To your question, without checking (but I can go and double check this if you need)
no citizens have naturalised under this practice as far as I can remember. However, a number of applicants have applied under assumed names, but what we find is that those that do this don't actually go on to become full citizens. To this date, the only person going around in Talossa using a pseudonym is Sebastian Penache, I believe.
By the way, this isn't just about internet privacy and incognito pseudonyms. There are various legit reasons that someone may wish to become Talossan using a name other than the name printed on their macronational identification, such as divorced surnames or transgender name changes. So, to prevent those legitimate cases ever ending up a cause for fraud charges, we permit them to use a different name as long as they have been truthful and open to begin with during immigration.
In case you are wondering, and in anticipation of follow up questions on this, in almost all cases we now ask the applicant to provide at least one link to a social media account in their true and legal name. We have a look at that profile, ensure it is in the legal name of the applicant and just generally check for any signs that the account is legit (age of account, etc). Interestingly, in the past week or so the Immigration Secretary has actually forwarded me two cases where the applicant was unwilling or unable to provide details for a social media verification check. One of those cases went to an 'immigration interview' with myself where the applicant did go on to provide me with adequate evidence (although that person wasn't actually applying using a 'deed poll' name; they just don't use social media). The second case was where they applied using just a forename and no links to social media. Upon further communication that applicant provided a surname, but still refused to provide any links to a social media profile. This application was rejected.