Giving away or selling videos created using AE.

I think what the guys are saying is that as long as you don't provide the original files in your project template, you should be fine as it's transformative.  In other words, render out any effects and masks you have applied to the stock footage - this will not only reduce your customers' render times, but you also prevent them using the original - that's Rick's "You cannot do anything that would allow a user to use your paid-for Adobe Hammer (After Effects) to create new content."

Also as a personal plea, given the number of posts on here from people trying to adapt projects, please don't try to hide how you've built a project using Shy layers, expressions and obscured comps in the project bin.

All Adobe Products are just patented and protected fancy hammers designed to do a specific job. You buy the hammer, and you are licensed to use it. You can sell anything you create with the hammer, even if the sale requires the user to buy one of the fancy hammers Adobe makes. If you don't purchase Adobe's hammer, then a template for any project has no value, so there is no copyright or patent infringement. The same thing goes for 3rd party plug-ins. You can copyright, sell, even patent any template, script, or other tools that help a fancy Adobe Hammer user with their work. You can copyright or sell any product (video) you create using Adobe's tools and even patent a process that uses Adobe Tools.

You cannot create any application, script, or web-based service that allows another user to use your Adobe Hammer to develop products they could not make without purchasing Adobe's hammer for themselves. You could not load After Effects on a remote computer and allow other users to create compositions, add assets, create animations, add effects, render a product, then distribute it in any way. That would be patent and copyright infringement.

Did you follow that? It's pretty simple. You can sell any content you create (a movie with After Effects). You can sell a Template, design a plug-in, or create a script that simplifies any operation using any Adobe Product.

You cannot do anything that would allow a user to use your paid-for Adobe Hammer (After Effects) to create new content.

If all you want to do is create a Render farm, I am pretty sure that Adobe has licenses for that. All other unauthorized use of their products is prohibited. It's the same for Windows, Mac, Word, or any other protected software.

As far as Adobe is concerned, as long as you sell an exported, substantially edited video, and not any assets downloaded from Adobe Stock, you may sell the exported video.

Check your Envato license for their terms.