Well, I know a number of economically liberal Pirates and Pirate voters who gave up simply because of the basic income and other leftist policies.

While this clearly is just anecdotal, it might explain the bigger pattern why the Party had more success 3 years ago while it was clearly economically liberal, and while it is stagnating today where it is clearly turning more and more to the left. Younger Germans, who initially grew the Pirates, neither wished nor need yet another leftist utopia lying to voters about things they cant finance.