I don't know why, but sometimes this is done intentionally.
In my (Dutch) city, there is this infuriating piece of road where the bicycle path suddenly gets routed onto the kerb, intentionally mixing bikes and pedestrians. I believe the theory is that bikes will go slower so pedestrians don't need to worry about crossing the road as much or something.
Predictably, lots bikes are taken by surprise, either brake hard and suddenly or fly through pedestrians (who the biker thinks are in their bike lane, because they would be two meters earlier).
In my experience, when bikes and pedestrians meet, one of the two groups is in the wrong place and should be watching out/slowing down and waiting.
The example video shows various instances of pedestrians walking in bike lanes (and seemingly being surprised at the sudden appearance of a bike there). You can't fix stupid, but at least you can tell them to get off the bike path.
I wish my city only had a single case like that. Unfortunately, in Tallinn, it is extremely common that a bike path is suddenly routed onto the curb, and that's when you're lucky. For some paths, the path just... ends, and you suddenly find yourself right in the middle of car traffic. Unfortunately, the city leadership is anti-bike and pro-car, and it shows in the infrastructure.
Paths where pedestrians and bikers (and other light transportation vehicles) are mixed are overwhelmingly common.
> In my (Dutch) city, there is this infuriating piece of road where the bicycle path suddenly gets routed onto the kerb, intentionally mixing bikes and pedestrians. I believe the theory is that bikes will go slower so pedestrians don't need to worry about crossing the road as much or something.
That is an unfortunate, probably experimental?, traffic design choice...