Patreon pays writers based on how many paid monthly subscriptions they attract. The person claiming to be Ms. Savage had drawn about 1,800 followers, each of whom paid at least $3 to view the three posts published on Saturday and Sunday. Patreon said all the subscription payments would be refunded and the creator of the posts would not receive any money. It sent an email to subscribers on Tuesday saying the account had been suspended because of “suspected fraud.”

The person claiming to be Ms. Savage did not respond to several messages from The Times seeking clarification on her identity. Nor did anyone claiming to be Ms. Savage publicly accuse the author of having impersonated her.

Mr. Kelly, 52, is in jail facing numerous state and federal charges including child pornography, sexual assault and obstruction of justice. He is also accused of bribing the family of a teenage girl so she would not testify against him in a child pornography trial, in which he was acquitted of all charges in 2008. His lawyer, Steve Greenberg, did not respond to a request for comment on Tuesday.

The Patreon posts were striking not simply because of the abuse they described, but because the real Ms. Savage has been a staunch backer of Mr. Kelly, showing up to support him in court and defending him on national television. An Instagram page, also under Ms. Savage’s name, linked to the posts. Before the additions this past weekend, the Instagram page contained only two selfies of Ms. Savage, both from July 2017.

Instagram said on Tuesday that after reviewing the account, it found evidence that it had been hacked “some time ago.” It has restricted access to the rightful owner if she logs in again.