I had a look at it in a previous workplace. For the volumes of data that we were looking at it came to a lot more than that. I Built an equivalent app to join two services in a couple of days.
Zapier makes more sense for many smaller tasks. A common example I'm familiar with is to connect the output of a Google form with a crm search and create a ticket to follow-up based on some filters. This is something that you can set up on Zapier in 10 minutes, and you wouldn't want the hassle of actually maintaining your own backend for something like that.
