[keda]

AFAIK, Google IME also sends user phases to their index of popular words, but they do allow you to turn it off.

[Brakenshire]

Baidu has a switch which apparently allows users to stop sending data, but it doesn't do anything:

> Although this automatic data transmitting function is switched off in the default setting, Sugiura found that Baidu IME secretly sends users’ information even when the function is turned off.