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Almost. SNI slots are free - Yes, but still you have to buy the SSL certificate from somewhere (cheapest are something like $8/year - https://www.ssls.com)

If you can use any CA, you can get a free certificate from StartSSL https://startssl.com/

And since SNI isn't legacy-compatible, Google itself recommends to "detect browsers that do not support SNI and recommend a browser that supports it"

https://developers.google.com/appengine/docs/ssl#server_name...

Another note: You can host a static site on Heroku for free if you like as well. I have multiple on there.

Practically yes. I probably should add the SSL also and make a post of it.