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Oh, indeed I forgot that good VPN-s are paid :)

Besides Tor, you could get a free AWS/Google Cloud account and do content submission from a free, minimal VPS machine.

You need to add a credit card, even for free accounts

Fair, but you get the idea, you can edit the GIT repo easily that's hard to detect who's doing it.

I think privateinternetaccess accepts money in envelopes? Either them or ProtonMail