I'm confused, you make it sound like a free CDN is somehow a bad thing. You do realize people actually pay money to have their content on a CDN. I don't think Bing makes money on their AMP cache, and doubt they would want or even allow Google to link to content on their AMP cache...
The point of AMP cache is for Google (and Bing) to waste money making content faster for their users, in the hope that the user will then spend more time on search so they see more ads. The cache itself has nothing to do with the monopoly, and the fact that Bing can use AMP at all (since its open source) to get the same benefits actually shows the exact opposite.
I'm confused, you make it sound like a free CDN is somehow a bad thing. You do realize people actually pay money to have their content on a CDN. I don't think Bing makes money on their AMP cache, and doubt they would want or even allow Google to link to content on their AMP cache...
The point of AMP cache is for Google (and Bing) to waste money making content faster for their users, in the hope that the user will then spend more time on search so they see more ads. The cache itself has nothing to do with the monopoly, and the fact that Bing can use AMP at all (since its open source) to get the same benefits actually shows the exact opposite.