If you search "Elementor Loading on the forum, you will see there are many other users like you who experience the same issue.
Elementor is a heavy plugin and it is very resource intensive for free hosting. InfinityFree servers do not meet the minimum system requirements for Elementor, so for this reason it is not advised to be used here.
There are other alternative plugins that you can use, or you can just use the default WordPress editor.
I would say it’s because of Elementor, which is big, bloated system with really high system requirements as a result. But if Elementor needs big hosting and free hosting isn’t big, then you can decide for yourself what’s the “cause” of the issue.
I’ve heard some people talk about Divi, which has much lower system requirements than Elementor does.