They didn't pay before but there's some ways to press Germany to compensate for it now.
Poland is being compensated as we speak. The EU funds are financed in big parts with german money with Poland the biggest beneficiary...we are talking about Billions here..every year...
To rebuild Poland, to bring it up to western standard...the cohesion policy, european solidarity, the EU Marshall plan if you so want...the same you want to kick in the bin, believing Poland would be better off without it....ironic actually!
polska.pl/economy/investments-projects/eu-funds-poland
cohesion
/kə(ʊ)ˈhiːʒ(ə)n/
noun
noun: cohesion
the action or fact of forming a united whole.
"the work at present lacks cohesion"
synonyms:unity, togetherness, solidarity, bond, sticking together, continuity, coherence, connection, linkage, interrelatedness
"rewarding individuals breaks the cohesion in the group"
ec.europa.eu/regional_policy/en/policy/what/glossary/c/cohesion-fund