Would you be okay if Stockfish also went 3$/month and the only thing that could be publicly downloaded was Stockfish 11's source?
This is clearly done to get monetary benefit from the work of others (Stockfish developers/StockfishNNUE's developers, which didn't add the paywall), which is fine, just don't pretend it's "to have it easy for users that don't have to deal with too many versions and networks."
The standard is "Beta versions", between releases beta versions advice users that want it easier to stick to just using releases, while the rest of users can download the beta versions between releases. That's basically Stockfish's model (many people ignored everything and just jumped from Stockfish 10 to 11), and that's the best for users.
Since this seems powered by greed I only hope that a different StockfishNNUE branch appears and it outpaces StockFiNN, because this can't be the future.