I think Greta Thunberg feels passionately about environmental issues and has done a huge amount of good work. Unfortunately, I think she's now being used as a commodity by people who want to create a brand from and around her - that's obviously not her fault, but there are a lot of people now jumping on that particular bandwagon (the Casiraghis aren't exactly known for their eco lifestyles, for example)
I suppose all we can hope for is that these influencers raise awareness of the issues and back it up with the science, but while we've got Govts across the world ignoring these messages to protect business then it will be many years before we see any real change. Doesn't mean we shouldn't keep chipping away, but I don't think this sleb event should be hailed as anything more than an indulgent jolly.