Are there websites where I can do simple tasks like distinguishing/sorting images, writing captions, selecting correct options or other tasks I can do in my free time or mindlessly whilst also contributing to meaningful projects? Something like Google Crowdsource, although I would like to avoid registering to any privacy invading services asking for my personal info in order to contribute.
Another good one is https://commonvoice.mozilla.org/en/ where you either read out text or validate recordings by others. These samples help creating artificial voices.