This is what makes me uncomfortable. The biggest point about cryptocurrencies is that they are not centralized. In that sense Stellar seems a lot worse than regular currency. With a regular currency, at least the respective Central Bank or other monetary regulatory authority has credibility and accountability in the sense that they are indirectly elected by citizens as they are selected by the elected government. As such they have to have a history of integrity and monetary experience, and can be removed if they act unethically.
Stellar's board, on the other hand, is self-elected, and with all due respect, don't need to have the level of accountability or have the credibility of running such an organization, which even if it owns "just 5%" (+2% of Stripe's) of the currency can potentially have substantial control over it. And being a non-profit doesn't add a stamp of either, means little.