Thank you very much. At the moment, I currently don't have a clear plan on making (besides through my Patreon, which gives patrons access to an RSS feed for listening on platforms), as these platforms require monthly/yearly subscriptions for episodes to stay up. YouTube also causes issues, as the platform sometimes auto-blocks uploads due to audio clips used (I learnt this while making YouTube video essays back in 2018 and found the process of editing, re-rendering, and re-uploading essays very frustrating). Looking at the media player on both Patreon and Scritch Editor, you're right, neither have a control to change the speed for audio. I apologise for this missing feature. I'll keep my eye on both Patreon and Scritch--hopefully, one or both of them will add a speed control in the future.
I didn’t realize Apple had started charging storage fees. The podcast I co-host has been running for more than a decade, so we may be getting a different deal from newer shows. Youtube is indeed annoying, and probably only worthwhile if you have a video component. In any case, your show sounds great, and the lack of speed controls is just a minor quibble.