Crowdsourcing projects run the gambit in covering all kinds of science:
Outbreak Near Me, which is an offshoot of Flu Near Me, a community watchdog group keeping an eye on ... well... outbreaks via weekly texting and emails. They also helped monitor COVID cases as well.
Which video touches upon
an astrophysics crowdsourcing project where you compare two separate images (one taken 50 years ago with a contemporary image of the same error) and you must figure if the center object (likely a star or nova remnant) is still there, moved, or completely disappeared.
And I've touched on BOINC crowdsourcing through using spare computing time on your home and work computers.
Bird counts are once-a-year events held around the world like the Central Park
Audobon Christmas Bird Count.
Many cities follow that project design to gather a homeless count/population prewinter season.
So? Have you volunteered for a community or wider-scale crowdsourcing project for the sake of science? What kind was it? How labor intensive was it? Was it a gamified project?