If you're app is using hotwire, I'd definitely recommend that route instead of creating custom channels. It's much cleaner now-a-days and it seems to be more stable and easier to debug.
Any thoughts or reasons why you wouldn't want to use ActionText? I know it's not as full featured, but I found that it is "good enough" in most cases. One issue that I've found with most WYSIWYG editors is that they are inherently insecure. You have to actively sanitize the user input to prevent XSS. Are there certain features that you'd like to see in ActionText that Summernote has?
From what I understand, a stopped AWS EC2 instance will not get charged, but the IP/Volumes may still incur charges. Folks should definitely do their due diligence when selecting a provider, but I appreciate the corrections. ❤️