[gmac]

That is literally no different than people who push regular Ruby/Python/PHP/NodeJS/Perl/etc apps to platforms platforms like Heroku

It is different. On Heroku, you have to think (a little) about server configuration, and (especially) about how many servers you need.

In the 'cloud', they're someone else's servers, but they're at least somewhat visible to you. In 'serverless', you don't see them and don't have to worry about them (one hopes).