You see that wrong. Switching the model is always a bad move. Do you remember the community outcry when Team Fortress 2 switched to free to play? Also selling the game as "Yo, you can play that stuff for the price of 60 Gold Dubloons, no monthly fee." and then switching to "Please give us 10 Gold Dubloons every month, kthxbye" is considered false advertising AFAIK and can lead to some nasty lawsuits.
I approve of the monthly subscription, because I like to support things that I enjoy. That's why I give some money to Youtubers/Musicians/Whatever via Patreon. I enjoy their work and don't want them to quit just because they don't have time anymore for things that brings them more money in.