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Most of the users have credentials from their institutional IdPs, but the percentage of these federated in eduGAIN or other federations has not been assessed.
DARIAH
DFN-AAI/eduGAIN is feasible and being used by a number of users. However, there are lots of user accounts in the homeless IdP LDAP server for users that either have no federated IdP or with an IdP that does not release ePPN
And there is some number of users that simply are aware that "a DARIAH account" can be their institutional account, who even do not try to log in via AAI, going for the homeless user option.
PSNC
In Poland there are not many institutions federated with eduGAIN or PIONIER.Id, therefore an important fraction of the users have no access to federated ids.