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financial ressources for what, exactly ?

employees. hosting costs. programming costs. internet link. infrastructure in general.

Please don't forget it's a decentralised approach;
A big chunk of the underlying infrastrucutre is run and paid for by the witnesses / users.
Innovations come from the userbase.
So does marketing and promotion.
I don't know, but I would expect the costs of Steemit.com to not be too high.