I disagree. Whether it's a good design depends critically on what the future holds. Will costs go through the floor? We should, and can predict this.

What does it cost to host lambdas? Not a lot. So we are good from that PoV.

Will it be commoditized, or will there be crazy markups? Can any random guy set this up? If you really want to check this, try setting one up yourself and see if there are any roadblocks. (I didn't)