Huh? I use Apple Podcasts, and used Google Podcasts before I switched to iPhone. Haven't seen an issue like that. Everything I care about seems to be available on everything, and it's easy to add RSS feeds (e.g. from Patreon) in both apps. Maybe you should try using a less hostile app?
That doesn't refute the original point, though. Apple Podcasts and Google Podcasts are products that embrace the open podcasting model. Spotify and Youtube Music do not, and these are the products that the original comment is referring to, where you are not able to add a subscription using an RSS feed.
