Hi Aileen
Just chipping in to share my experience with you.
I have T1D and currently following a keto diet (having tried moderate and low carbs before). Had the same questions as yours. It's not yet that a well-known diet so many dieticians and doctors are uncomfortable advising on it (because it is not in line with the official guidelines of many countries of recommending a low fat diet).
I echo the comments of many others on this thread in that the keto diet is bringing me significant improvements to date on the various metrics to watch out for with T1D (BG, weight, cholesterol etc.). To answer your question, yes it is mainly aimed at T2D people, but is good for people with T1D too as far as I have read, been told and tried (provided we make sure BG does not spike to avoid DKA).
The trick in the keto diet is to get the balance of daily macronutrients right every day (if too much carbs, ketosis doesn't kick in, if too much proteins, those proteins get turned into glucose and ketosis doesn't kick in). I find that to be the trickiest thing to do, because keto diet isn't really more expensive to do and it also means high fat (esp. good one), and thus generally very tasty food. There are a lot of resources on the internet on how much you should aim for of each macronutrients. Also, watch out for the hidden carbs in various foods (for example many fruits are high in carbs, yogurt etc.) and for hidden proteins (dairy/cheese would contain more than you'd expect).
Re insulin, I continue to take the basal one daily and it generally does the trick (need for no or very small amounts of bolus for now, except occasionally for proteins as also mentioned by others above). As T1D you won't get off insulin injections completely, but as far as I have tried it significantly reduces the need for it, which has a bunch of advantages as you probably know!
The real debate is whether
keto is better than standard
low carb diet (i.e. less than 130g carbs a day-ish). In my experience, both are very good at managing diabetes because they lower BG/make it more constant (thus reducing risks of hypo), reduce need for insulin (and thus increase insulin sensitivity) and reduce weight. Both have their pros and cons, and I think at the end of the day it comes down to what works for you in terms of flexibility, taste, time-commitment, priorities etc.
I hope this helps.
Alex