A perusal of Automate.io's website makes me think automate.io might be somewhat comparable to Flow/Power Automate.
Power Apps on the other hand is more to build an actual, browser-run App (although you can certainly make something inside a Power App 'trigger' a Flow execution).
As usual, I think Microsoft's upper hand in this area comes from the usual place of strength: integration and bundling (to use those terms very loosely). If, as a business, you already use things like Sharepoint and Office 365, most users if they knew about both Flows plus some other tools, they might as well go with Flows as it's so tightly integrated with all things 365 and MS. Unless the Cost variable goes strongly in one particular direction..