Nah, the presentation framework is open source (http://github.com/hakimel/reveal.js) and we provide an export option that lets you easily get the HTML contents out for migration.
I have a habit of assuming bad faith whenever money is involved, but looking at your pricing information, you're really just charging for a service...
and oh god, look at that mark up.
<section data-markdown>
<script type="text/template">
## Markdown support
For those of you who like that sort of thing.
Instructions and a bit more info available [here]
(https://github.com/hakimel/reveal.js#markdown).
```
<section data-markdown>
## Markdown support
For those of you who like that sort of thing.
Instructions and a bit more info available [here]
(https://github.com/hakimel/reveal.js#markdown).
</section>
```
</script>
</section>
That said. Looks like they hold your slides hostage if you don't pay. Scary.