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I came across this a long while back -
I got an MA place to study applied moral philosophy, and would have been interested in this sort of area, but didn’t have the money to fund the course. Anyway.
It is similar - a secular tithe - but (unless the last 15 years have changed things) they advocate being public about it, to try to normalise it.
I am not as good as you, and gave 5% for a long time, but that fell by the wayside in job changes… I should really pick it up again. I also wasn’t super public about it, just if it came up, but I’m not sure why.
Secular people operating a tithe.
I assume (perhaps wrongly) that everyone does gives to charities... but more the "10% of income" thing which I think is more specific to some religions.