Michael "Shroud" Grzesiek, a popular Twitch streamer who signed an exclusivity deal with Microsoft in October, saw his US audience reduced by two-thirds since moving to Mixer.
That's according to StreamMetrics, which broke down some data on his US viewership since the move.
While just 15% of Grzesiek's US viewers followed him over to the new platform, this still accounted for nearly half (47%) of his new American audience.
In October, before moving to Mixer, Grzesiek boasted a US audience of 718,000 unique viewers, compared to 231,000 in November.
Grzesiek's US audience on Twitch was 1.62 times larger than the entire US audience of Mixer combined.
Mixer's previous deal with Tyler "Ninja" Blevins appears to have delivered mixed results so far; according to a report from Streamlabs and Newzoo in October, total hours watched on the platform was down 10.6% in Q3 despite the Blevins exclusivity deal.
Twitch has responded however, and earlier this month closed exclusivity deals with Benjamin "DrLupo" Lupo, Saqib "LIRIK" Zahid, and Timothy "TimTheTatman" Betar.
For the record: This article previously stated Benjamin "DrLupo" Lupo, Saqib "LIRIK" Zahid, and Timothy "TimTheTatman" Betar had signed exclusivity deals with Mixer, rather than Twitch. The copy has been amended accordingly.