Who would you donate to, if you'd donate to an effort in the "plastic space"?
And I've seen various cottage industries in the developing world grow out of/highlighted by Precious Plastic - ones who provide perhaps 5-30 jobs in poor and polluted areas of the world. A warehouse, some crude but effective machinery for processing the waste.
Ocean Cleanup claims to have removed 21,000 metric tons of plastic in its existence.
If we assume linear growth in budget, that's $330M Euro / 21k ton = 15,000 Euro per ton of garbage.
About 10 million tons of plastic end up in the ocean each year, so over their history, they've cleaned up 0.2% of the annual input.
I can't really comment if any of that good or bad, but I thought numbers (even if squishy estimates) would be helpful to inform the discussion.