Hello @Ranan,
I would not bother too much here and call jQuery to the rescue :
jQuery(document).ready(function($) {
$("#_terms_67bf5c09525eb").prop("checked",true); //let's check it to enable submission
$("#_terms_67bf5c09525eb").parent().hide(); //hide it.
});
Can’t you see the javascript being injected in your code source of your page (ctrl+u)?
Maybe some caching plugins or device (CDN) that you need to refresh.
You may try to add this code snippet to an existing *.js file, knowing that if it comes from a plugin or theme it will be overidden at the next update.
If you do so, try hitting ctrl+f5 to clear cache (to recreate the *.js file)
First snippet (original ID) is not working, second does.
Updated
jQuery(document).ready(function($) {
$("#_terms_67c5e0bc4d646").prop("checked",true); //let's check it to enable submission
$("#_terms_67c5e0bc4d646").parent().hide(); //hide it.
});
You may have to address (target) this checkbox differently, should the checkbox change again.