We absolutely have blackberries. In my neck of the woods, there's apparently 2 species of blackberries, one of which is highly invasive. I was going for walks about a month ago, specifically routed to pass by as many wild blackberries as possible, and they were very delicious!
I avoid anywhere with blackberries and raspberries when they're in season; that's where the bears tend to hang out, and I'm not super keen on surprising a bear when I'm out hiking.
Surprised a family of bears (sow and two yearlings) trying to walk out of my basement last week in the dark. That was not fun.
Yep, currants took a hit because they were a vector for a pine tree infection that rocked our logging industry and led to a ban on currant growing like a hundred years ago. Currants aren't banned at the national level anymore.
And even through that, we have had creme de cassis as a liqueur that a decently built out bar would have.
Grape jelly is more popular than jam, but we have both. Grape jelly is kind of an essential foodstuff in a lot of houses for making peanut butter and jelly sandwiches, which is a common food for children.