90% of the market for Zapier is people who have no technical knowledge. Those people won't be jumping on AWS any time soon.
Obviously pulling the 90% out of my ass, but I'm heavy Zapier user for my e-commerce business. I have (Or had - Haven't renewed as e-com has replaced my DevOps income) multiple AWS certs and I'd still much prefer Zapier over this. Especially when you can run custom code on Zapier for more complex cases anyway.
I'm sure there's way more I can do as well. I have to find the balance between automating and just telling an employee to do it But automation leads to less mistakes
This depends on price and by that time its possible that Google Cloud Platform and Microsoft Azure will start jumping in on the integrations market too, further squeezing the likes of some enterprise-only integrations such as Tray.io which still has less integrations than Zapier in general.
It's still too early to tell, but we'll see how fast Amazon adds support for more API integrations or if GCP and Azure will join in and do the same.