For a static site, I think 100 submissions/month for free is probably more than enough for the majority of people. Though going straight to $19/month is a pretty big step if you're just hosting your own personal website/blog.
It's $0,019 per submission, which I think is a fair price if you're actually sending that amount (and making money from it). It would costs you much more to build unless. That said, for personal (free) use there are a lot of alternative options.
This is indeed the case, playing around with new tech. I've been a happy customer with DO for years but my own website was the ideal case to try out the whole serverless thing. As my website doesn't get much traffic so it'd cost me next to nothing. I do agree with most of the comments here though and the $5 DO box is the safest choice. I might have been a bit too excited with the new things and failed to think logically :)
It's $0,019 per submission, which I think is a fair price if you're actually sending that amount (and making money from it). It would costs you much more to build unless. That said, for personal (free) use there are a lot of alternative options.