They haven't formally announced it yet, but YouTubeTV is going to have a price increase between $15-25/month next year, depending on what channels and DVR capabilities you want. So buyer beware.
The problem with all of the streaming services is that they are all hemorrhaging money. Their programming costs are the same as cable companies, but they can't make money by selling you internet. The business model for them was to build subscribers quickly, then increase the price to less than cable, but still expensive. They're all going up sooner rather than later, or they'll just fold like Playstation Vue is.