Can I still earn YouTube ad revenue on Podspun?

Yes, if your source is YouTube and the channel is set to Ads play under How videos play in Podspun.com Setup. That mode uses YouTube's standard player, the kind YouTube runs ads on, and the revenue flows to YouTube and you exactly as it does on youtube.com. Podspun takes no share. See the full answer under Will my YouTube video ads run on Podspun.