What is the Lock-in effect in WordPress?

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The Lock-in effect can be understood as the problem that users have when they are forced to continue using a theme or plugin, since if they try to change them they will lose their content.
Some examples of the Lock-in effect would be those mentioned below:
In the following image we see that we have a visual layout to build content. This layout uses its own shortcodes and replaces the native WordPress editor.
If we deactivate the layout we may lose part of the content and design:As shown in the following image, after deactivating the visual editor we will see a series of shortcodes and attributes, but only part of the content. The rest of the content will have been lost:
Example of disabled layout
In the following image we see that after activating a theme, it has usa phone number list two menu items or Custom Post Types as part of its functionality: one for portfolio and testimonials:
Menu items created by theme
If we enter content in these items we will lose that content if we decide to change the theme, since the menu items created by the theme will have disappeared, as shown in the following image:
Menu items removed when deactivating theme

How to know if a plugin or theme generates a Lock-in effect in WordPress?
The easiest way to find out if a theme or plugin is causing a lock-in effect in WordPress is to simply try deactivating or uninstalling the theme or plugin.
If you do this and still see that all the content, even if it is poorly laid out, is visible on the front-end of your site, then it is not causing a lock-in effect; however, if you see a series of shortcodes or the content does not appear at all, then there is a lock-in effect in WordPress:
In the following image we can see that after deactivating the plugin it has left us with only one shortcode. If we decide to change this plugin we will have to enter the content again in the new plugin.