[4] He was active in the father’s rights movement,[5] he was one of organizers of the campaign “stopstopnop”[6] polemicizing with opponents[7] of mandatory vaccinations for newborn children.

[13] In December 2015 he was awarded the "Freedom Prize" by Towarzystwo Dziennikarskie[14] in recognition of his civic activity, in particular for the swift organization of peaceful protests in defence of democracy and civil rights in Poland.

[17] On 4 January 2017 it was revealed that Kijowski had a potential conflict of interest, as while serving as the leader of KOD, between March and August 2016, his company "MTM" billed the organization monthly for IT services.

[18] In June 2018, the trial of former KOD leaders - Mateusz Kijowski and treasurer Piotr Chabora - began in the District Court in Pruszków.

They were accused of misappropriation of PLN 121,000 from public collections of the CODE on the basis of fictitious invoices for IT services of Mateusz Kijowski.