There’s also Radio Garden https://radio.garden/
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I suppose that the not public podcasts could be aggregated somewhere, but I'm less of a fan of that, and there's also some technical reasons why this would be more difficult than it was to aggregate these IPTV HLS streams.
Being able to view them by country or whatever is interesting, though I think perhaps less so for podcasts than something like live news, but not a bad idea
..which is yet again something I find both interesting and kind of funny (that they have "standardized" the philosophy of "pay what you want")