From human rights watch
"In December, prosecutors produced evidence of corruption in Erdogan's government. Four ministers resigned, and, most damaging, an audiotape was leaked in which Erdogan apparently tells his son, on the morning that the corruption scandal broke, to remove large amounts of cash from their home and conceal it with relatives and associates. Erdogan has said vaguely that the recording, along with other incriminating leaked tapes, are "fake," a "montage," and part of a nebulous conspiracy to overthrow him, but he has failed to produce evidence to substantiate these claims."
Turkeys media is owned by conglomerates which are especially vulnerable economic retaliation and political pressure journalists many have been fired for reporting on his corruption. When people went to social media to get more news on the issue he shut down social media. etc
The list goes on