It comes as little surprise to me that the AWS lightsail offering saved them money over traditional AWS services, just as they’d save even more using two dedicated servers with any reasonable provider and being able to have a hot-failover for everything.
At DNSFilter we’ve gone through the evolution of Heroku -> AWS -> VPSs -> Dedicated -> and now are setting up our first colo rack.
I did a price comparison recently between Dedicated, AWS, and Colo. Dedicated is 15% the cost of AWS for our needs, and colo will be 42% the cost of Dedicated for us.
Now keep in mind we have dedicated DevOps staff and are running at a very different scale from OP, and such a solution is not for everyone. But I personally have never understood the folks who love to brag about having spent much time and effort optimizing AWS to spin up and spin things down, when for the same cost I could just have a 10x more powerful server sitting there, on all the time to handle a spike in load, and I can utilize the extra resources or get things done faster with faster gear at 1/10th the price.