I think it is predictable, that some campaign with a fixed amount of sats per post could change to an usd rate when BTC is rising and fees too.
I don't ignore the volatility of Bitcoin, but frankly there should be announced rules for such changes of a fixed sats per post rate in a campaign. Otherwise it defies the purpose to offer a fixed sats per post pay rate in my opinion.
I wonder if the pay rate would've been raised if Bitcoin's value in US-$ would've taken the opposite direction in a significant manner. Anyway, let's enjoy the final days of this campaign and see what the future will bring.