In environmental circles / government level / NGO environmental groups level, yes it's high profile, it's internationally high profile.
With projects like this it's hoped the general public will learn and pay attention to the different categories - that's why they do the TV documentaries and the flashy award ceremony. But the key audiences also include angel investors, governments, NGO investors, science communities etc.
I'm not sure what you mean by "I did not think the Earthshot charity spent any money supporting the winners?"
The winners of each category each year get a million pounds towards their project. But they also get ongoing support from the organisation's expert paneles and supporters to help with their vision - financial advice, organisation advice, investment opportunities - one of the key elements of Earthshot is it's a huge international networking project for the environment. (and by ongoing the idea is they will have a network of support that goes way beyond the year they are involved)
It's only at the beginning of the ten-year vision but the first year winners and finalists are already benefiting from the publicity, exposure and community created around their environmental visions. The great thing is even some of the projects who didn't win their category are getting investment interest and mentoring support.
It's really an amazing project - of course we can't say yet, it's too early to know the long term impact, but it's a really valuable and potentially impactful movement.
I know you are fairly anti-royal / anti current Windsor family shenanigans but don't write of Earthshot - it's got the potential to be huge force for good.
I am fairly pro-monarchy, BUT that's competely separate from my knowlege and opinion about the Earthshot project. It's not an amazing project because of William (although fair play to him if it really was his idea) but because it's exactly the type of creative scientific thinking we need to encourage solutions for the climate crisis we are facing.