I think they have the expertise to switch to another solution quite fast and if amazon try something nefarious it would be a very bad signal to their customer a

I think they have the expertise to switch to another solution quite fast and if amazon try something nefarious it would be a very bad signal to their customer and maybe will alert government bodies like the EU's Directorate-General for Competition and others. So is it possible amazon to try this? sure but I will say it's improbable.