This is a wallet issue. Alby provided free wallets. They now provide code to host your own wallet, or paid wallets.
Fountain and Wavlake are using ZBD wallets. I don't know this to be true, but I suspect since both have investors involved, ZBD is one of those investors.
Most of the podcasting 2.0 feeds use keysend in their value block. Keysend isn't supported by most wallets. There's a move away from keysend towards lnurl, which will open up other wallets, but only if they allow NWC.
We're at a point that only companies with the cash flow to provide wallets or the infrastructure to support the wallets are able to do anything besides Alby.