The exodus was from the Kenmou board who refused affiliate marketing on their board they claimed was data mining their IPs. The desktop clients weren't banned,

The exodus was from the Kenmou board who refused affiliate marketing on their board they claimed was data mining their IPs. The desktop clients weren't banned, just really old browsers they were using were no longer supported due to new methods of embedding ads. A lot of them used legacy browsers like this one which is no longer in development https://en.wikipedia.org/wiki/Kazehakase https://en.wikipedia.org/wiki/Kazehakase