Addressing supporters from the top deck of a double-decker bus, he said: "We did it! You are incredible."
Also aboard the bus were Maks and Adaś, two of the boys for whom the fundraising campaigns had been launched.
'Nobody knows how to help like Poles do'
Hancke urged continued support for sick children.
"Every kind of help is worth its weight in gold. I love you. You showed that you can unite. Poland is the best country in the world—nobody knows how to help like Poles do," he said during a live broadcast.
More than PLN 19.8 million was collected across three fundraising campaigns.
The largest share was directed toward gene therapy for eight-year-old Maks, with the PLN 12 million (EUR 2.8 million) target for his treatment reached on Sunday morning.
A second campaign, seeking PLN 3.5 million (EUR 827,000) for four-year-old Adaś, reached its goal hours later.
A third fundraiser was later launched for two-year-old Wojtuś, who also suffers from the disease.
Hancke began the ride from Zakopane on Friday afternoon, saying beforehand that the initiative aimed not only to raise money but also to demonstrate solidarity among internet users.
He noted that even watching the livestream contributed to fundraising efforts through advertising revenue.
Duchenne muscular dystrophy is a rare genetic disease that causes progressive muscle degeneration and primarily affects boys, leading to difficulties with movement, breathing and heart function.
While there is no cure, modern gene therapies can significantly slow the disease's progression.