GH > high welfare dependency in certain communities are well known and politicians have refused to limit those payments
I don’t know who is using what sources, how would you know. There are bunch of yeshiva bochrim selling iphones on amazon. They might be losing on storage fees or be millionaires based on a hidden brochos.
as for using welfare sources, if you would have payments clearly going to Jewish recipients and community understands what it is for, then, I guess, you can say that the community is willing to support Torah studies and this is kosher. I doubt that this is the case, though. In most places, Jewish recipients are subsumed among larger numbers of non-Jews, and even when this is not so, a lot of government payments are coming from non-local sources, including federal.
Syag, if I remember correctly, claimed that government worker said to her that she is ok with supporting wonderful Jewish community. I think this is the same as when a store worker gives you free stuff – he is not the owner.