Piotr "Łatwogang" Garkowski ran a continuous nine-day stream on YouTube from 17 April, inviting celebrities, athletes and fellow creators to join him in person at his Warsaw flat or online.
The stream drew an audience of more than 1.4 million in its final minutes before ending on Sunday evening.
All funds go to the Cancer Fighters Foundation, a charity providing medical, psychological and practical support to cancer patients and their families.
The foundation said the money would be spent on treatment, rehabilitation, medication, specialist consultations and transport to clinics, as well as equipment such as prosthetics.
It also announced it would publish a dedicated website to track how the money is spent.
Among those who took part were footballer Robert Lewandowski, ski jumping legend Adam Małysz, singer Roksana Węgiel and actor Cezary Pazura.
Several female celebrities, including singer Katarzyna Nosowska, shaved their heads live on stream in solidarity with young cancer patients.
The fundraiser was inspired by a rap track recorded by artist Bedoes with Maja Mecan, a young Cancer Fighters beneficiary, which drew public attention to childhood cancer.
Łatwogang then put his stream's length to a fan vote – one TikTok like equalled one second of broadcast – resulting in the nine-day format.
A media analyst at the University of Warsaw suggested the campaign could become a defining fundraising event for younger generations in Poland, comparable to the country's long-running WOŚP charity drive, though in a streaming format shaped by audience participation.
According to a report by the Res Futura analytical collective, 97 percent of online commentary about the event was positive, with the dominant narrative describing it as a historic achievement for Polish internet culture.
(ał)
Source: PAP