PaaS solutions are worth more than IaaS I think -- someone is applying security patches, autoscaling your app, load balancing, etc. For a more apples to apples comparison:

It's 5x the cost of Elastic Beanstalk... 250 / (0.067 * 24 * 365 / 12) = 5.11 -- though this is misleading because the closest instance was an m3.medium, which has 3 vcpus and 3.75gb of ram. You can also get a major discount if you go reserved.

It's 0.68x the cost of App Engine F4 instances (the biggest available).. 250 / (0.20 * 2.5 * 24 * 365 / 12), though those only have 1G of ram, so that's assuming you somehow buy 2.5 of them :p

It's 2.2x the cost of AWS Lambda... 250 / ((0.000001667 + 0.000002501) * 10 * 60 * 60 * 24 * 365 / 12) = 2.28, though this is misleading because it'm adding up a 1.5gb instance and a 1gb instance. Also it's likely much cheaper as Lambda only charges you for used time, and almost all traffic loads are TOD / DOW dependent.