An online shop that won't let me pay. Sounds absurd, but that is exactly what happened to me at Gurkerl this week.
I wanted to place a small order, but under 39 euros the site wouldn't even let me get to the checkout, the button was simply greyed out. The crazy part is that this isn't a bug, it's on purpose. Under 39 euros you can only order if you have a subscription, otherwise that amount is just a dead end.
The reasoning is supposedly sustainability, because lots of small deliveries don't add up ecologically. And a rule like that probably only gets waved through in a country like Austria, where in some places you can't even pay by card under 20 euros.
Except the math doesn't work out. Enough people bail exactly at this point and then shop differently, drive to the supermarket themselves or order somewhere else, often far less ecologically than one single bundled delivery. So the barrier that's meant to protect the environment actually pushes people into the worse option.
On top of that there are two pop-ups that jump at you at the same time when you open the page, and a navigation that sticks to the bottom edge like in an app, instead of at the top like on a website.
And that's the real point: in e-commerce the rules have long been written, loud and clear, and unlike LinkedIn, Gurkerl has real competition. Every barrier, whether it's a bug or a deliberate decision, is in the end a customer who orders somewhere else. Even the barrier that actually meant well.