The reality is it’s incredibly difficult to cut ties with the Meta tech, as we got so used to it since the Facebook early days, then WhatsApp, then Instagram, etc.
There are alternatives but to convince half world to change is a huge task. Human Beings resist change by default and stick to something that works.
It’s also convenient because you can create an event and your friend are right there to be invited, so it’s an effortless task.
If you want an alternative you need to have something convenient, effortless and very easy to use.
Something like an app that lists events in your area, you select one event and then share it with your contacts. Or an app that shares integration with Facebook but does create invites outside Facebook.
There are plenty alternatives and ideas.
“Sir, what about Greenland?”
“Who?!”