I understand fitters these days use social media (Instagram) to show off their work and it is the perfect tool for that.
It is probably for the simplicity of posting and also the wider / different reach through that media.

The database makes it easy enough to just post a link.
If the fitters are too lazy to even update the database or do not post/have SM accounts to show their work then I would question whether they are fit (pun intended) to run a business.