Unfortunately ad-funded model did not work to keep the service free,
partially because of ad-blockers and mostly because of people building their
own colorization services on top of it to colorize hundreds of thousands of
photos without any help in funding (or even mentioning) this service.
The service costs are much higher than the revenue from the ads.
That is why I have to shut down the free colorization service.
The service is still available as Android app, and also
for the supporters of the web service (see the button below).
However, the scripted mass colorizations or any reproduction of
this service is prohibited without separate permission!