we stopped offering identity server a long time ago because of the privacy concerns the whole concept raised and the fact the only non-Sydent option at that time was basically abandoned (ma1sd). The situation was basically 2 bad decisions: either lock in with Sydent or don't use an identity server at all.
Considering the low interest in the identity server functionality and the amount of concerns around the concept, we took the latter bad decision - that way we don't offer a self-hosted identity server but don't limit customers in using the matrix.org's one (even with their own Matrix server). That seems like an acceptable trade off. After all, even Sydent's README contains the following:
> Do I need to run Sydent to run my own homeserver?
>
> Short answer: no.
>
> Medium answer: probably not. Most homeservers and clients use the Sydent instance run by matrix.org, or use no identity server whatsoever.
Considering the low interest in the identity server functionality and the amount of concerns around the concept, we took the latter bad decision - that way we don't offer a self-hosted identity server but don't limit customers in using the matrix.org's one (even with their own Matrix server). That seems like an acceptable trade off. After all, even Sydent's README contains the following:
> Do I need to run Sydent to run my own homeserver? > > Short answer: no. > > Medium answer: probably not. Most homeservers and clients use the Sydent instance run by matrix.org, or use no identity server whatsoever.
PS: I'm Aine, one of the etke.cc developers