alt Hacker NewsThrowaway account. I tried these sites a couple of times each in the past (the UK versions at least). I'm married now and fortunately don't have to deal with "the dating scene" and how awful it is/was.
When I signed up for Match, about ten minutes into the process my account suddenly changed to that of another man including different photo, descriptions, orientation etc. I don't know why this happened but it was absolutely mortifying and an outrage Match did this. I dread to think how shit their code has to be to somehow merge accounts or whatever happened. I deleted "my" account immediately.
I imagine that counts as excessive sharing of personal data.
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I met my current wife on OKC in 2010, before online dating became an utter cesspool.
I've been out of the dating scene for 16 years now, but based on what I see on social media, I think online dating sucks today for three reasons.
1. Many men (Not all, but many) are there simply because they want to get laid. They're not looking for a relationship, they're looking for a hook-up, and they're not honest about their intentions. It doesn't help that people argue over whether Tinder is a dating app or a hook-up app.
2. I'm not sure how to put this without seeming misogynistic, but some women greatly over-value themselves. Or at the very least, they have out-dated ideas of courtship. Some of them expect to be taken out to $50+/plate restaurants on a first date, while many men think women are just trying to score free meals. It's hard to make relationships kick off when they begin so adversarial.
3. Dating sites/apps have a financial incentive for your relationship to fail. They can give you matches they know are bad since it keeps you as a serial dater and on their app. They're in a sticky spot where their most successful customer is one that they will never see another dime from, and there's not really a way around it.
I had my OKC account hacked or merged to in the same fashion. I've never had this happen before with any online service.