I imagine data security and what the government would know is putting some off. It is part of the reason the national ID (My Number) faltered.

Off the top of my head, and I'm sure there are more, people use: tinder, bumble, Pairs, Zwei, Zekushi, and probably more. Pairs and Zwei, at least, are geared toward long-term and marriage. Pairs had a very bad UX and, of course, a cost. I did meet some people on there, but nothing lasted (one nearly did, but I wasn't doing another LTR with a barely-functional alcoholic that otherwise was a great match).