True, but Adblock Plus is GPL: https://hg.adblockplus.org/adblockplus/file/tip/C...

hannob on Sept 13, 2016 | parent | context | favorite | on: Adblock Plus now sells ads

True, but Adblock Plus is GPL: https://hg.adblockplus.org/adblockplus/file/tip/COPYING

That qualifies as Open Source under any reasonable definition of the word [1]. So being Open Source is no argument for or against either Adblock Plus or ublock origin, because both are.

[1] https://opensource.org/licenses/gpl-license