The CEO's response in that thread is very clear that they added an additional option to use Kite, and did not make Kite the default or replace the default.

I was a happy user of the python autocomplete package with Jedi for some time. Starting in November 2016 they introduced kite-specific code, shipping kite-installer as a dependency and also added tracking of your autocompletion behaviour (I suspect this is where they get their Kite vs. Jedi performance numbers from).

Only in February 2017 I noticed that the whole package had changed right under me because of an error traceback window caused by their metrics collection going wrong. I looked at the package settings and IIRC there was a checkmark set for the "Use Kite" option which I'm pretty sure I did not set myself.

The telemetry collection alone is a deal breaker for me. But I also don't like the sneaky way they practically took over the package without clear notice and consent. The package README still makes no mention of Kite and the package is running under the innocently looking 'autocomplete-python' GitHub org instead of their 'kiteco' org. To me it's a very fishy 'growth hacking' strategy.