Happy to take money? That money goes to family through Pakistan as platform. And some charitable projects as well which is great deeds. If people are expecting in return for charity, then it is not charity at all. As for contribution to the family, that is their family matter.
I am sure some nations give rights to vote for overseas, but that doesn't change the fact about the conflicts of interest, does it? We are talking about the fate of nation dependable on the overseas Pakistanis where their loyalty are alligned with the nations they live in. It is not ideal scenario at all.
If there is no conflict of interests, then you have case.
Beside those links you posted prepares the form for national citizens going overseas or live in overseas as national citizen can vote through the digital platform in sites. Remember, it is about casting the votes for those nations [as national citizens] while living in overseas for several reasons; work visa, trip visa,...etc.
Those cannot vote for Pakistan since those sites are not about Pakistan at all. If overseas Pakistanis are national citizens in those nations they live in, then they are not entitled to vote for Pakistan that might invite conflict of interests.