Some plugins and mods might contain what is known as malicious code which can cause severe problems in a server or single player client. Most mods do not have viruses but OrdusRC1136 is right, check the comments. Once a malicious mod or cheat has been downloaded and installed on a target machine, a dropper injects code into a new process to circumvent basic antivirus tools and detection algorithms. With these caps, you might not be able to reach the full storage limit for mods, but the additional storage capacity will allow for you to have larger mods within it.
The cap is set to 150 for Xbox One and 100 for PlayStation 4. Quick Answer: What is the best mage build in Skyrim?