The enterprise plan for Faker Cloud is $500/month [1]. Retool donate $500/month to Marak [2]. I understand that the donation is not the same as paying for the service. But it seems pretty shitty and greedy for Marak to complain about this, _even if_ Retool were in the wrong (Marak could have tried to resolve the issue with them properly, first, before starting a witch hunt).
Don't bite the hand that feeds you. This sort of thing really disincentivises me from wanting to donate to or use this project. Personally, I would completely support Retool stopping using faker.js and pulling their donation - but of course they can't do that since it'd be a PR nightmare.
EDIT: I see that Open Collective reports that Retool's donation to faker.js has been cancelled. I assume that it will be reinstated per David's comment [3]. But as I said above I wouldn't blame them for cancelling it.
[1] https://fakercloud.com/pricing
[2] https://opencollective.com/retool
[3] "In the meantime, we'll certainly continue sponsoring all the libraries we’re sponsoring already, including faker.js." https://news.ycombinator.com/item?id=27252331