They have. Compared to this, it got barely any news coverage.
That is why they do this. Their only goal is attention, and they do that quite well.
The way they seem to operate is quite smart, actually:
Their stunts get a lot of press and bring climate change to the forefront of people's minds, frequently.
They're not a political party, so pissing voters off isn't a problem. They can afford to be unpopular to further the cause.
Those who already care about the climate won't change that based on a small group they dislike.
Those who call them "terrorists" are people who call anything short of licking oil company boot "eco-terrorism". They were never going to be convinced to care whatever the group does. Probably read the Daily Mail.
Those who are apathetic about the climate are still going to be apathetic, with a bit of rage towards this group as with the others, but again, ultimately that doesn't matter as they still won't change anything based on a single group.
A small handful of people will be inspired by them and their constant reminders of climate crisis, and be motivated to push for change.
The last bullet seems to be the target audience of the group. And they're the ones who will actually do anything.