Normally 3 videos and 5GB/m for their free plan.
Upgrades free Wistia plan to 15 videos and 30GBs bandwidth. Service is used for putting videos on your own websites, similar to Dropbox's homepage.
You're getting around $10-15/m for free based on their pricing. The only difference from the free and premium plans are the amount of videos and amount of bandwidth.
Expiry date may actually be the 22nd of June, I'm not really sure atm.
Like you tube, but costs money?