If there is any single service I'd avoid on AWS it's Lightsail, it'll cost you a lot more than almost anything out there, is slow as molasses (even tiny services can need tens of minutes to deploy) and you'll experience random failures not even AWS reps can explain to you. Avoid at all costs.

It's a ghost of its former self, but I'd probably still rather use Heroku today than being forced to use Lightsail even once again.