Self-hosted movie streaming services like Jellyfin have some pros and cons:
Pros:
Free and open source
You control the data - it's hosted on your own hardware
Customizable - you can tweak the setup and add plugins/extensions as you want
Often supports a wide range of clients to stream to (web, mobile, TVs, etc.)
Cons:
You need to host it yourself - so you need the technical know-how to set it up and maintain it
You need the hardware to run it on 24/7
It may take more work to set up streaming to all your devices
You are responsible for security updates and patching
You are limited to the features/functions the project provides - you can't buy premium features/support

So overall, for technologically-inclined and self-sufficient folks who want full control and don't mind the extra effort, a self-hosted option can be great. For others who would rather pay for an out-of-the-box managed service, a commercial offering may be better.
It really comes down to your technical skills, time available, and needs.
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