When you say "artificial digital scarcity" are you referring to bitcoin's supply limit, or are you making a general statement about cryptocurrencies?
Cryptocurrencies are fundamentally a means of creating a decentralised digital scarce resource, and the Bitcoin blockchain is a rough proof of concept that it is theoretically achievable, albeit using a spectacularly inefficient method.
Artificial digital scarcity is the whole point.
Since we as a society require money to transfer and preserve value, the money being open-source, decentralized artificial scarcity(like Bitcoin) does not contradict with FOSS ideals. On the contrary, it widens them from a technological sphere to economics.