It's likely in the category of rude and annoying, but not 'illegal' or banned. So it's at the discretion of Disney whether or not to ask them to keep it down - and that's really down to how many complaints they get from other guests. It would annoy me if I were in a nice, signature type restaurant with a significant other trying to have a nice, high-end elegant meal...less so if I were at a casual eatery.
I think it would be smart o Disney to place such live streamers in the less desirable seats, where they're less likely to disturb nearby diners - placing them in a prime seating area with the best view was a poor decision since they're likely not even paying attention to the view - it's all about the food and their opinions/comments/talking. A table by the kitchen entrance, restroom hallway, or in a corner without a view would have been a smarter spot.
I certainly wouldn't go by the assumption that live streamers and bloggers are going to pay better tips - even when ordering many dishes, it's still up to the person how much they tip - and they could be cheap, low tippers, not believe in tipping, or not have that much extra money to tip big after ordering all the foods for their video. A couple on a nice, romantic night may get high-end cocktails, bottles of good wine, appetizers, entrees, desserts, after-dinner coffees, etc...and may end up with a bill nearly as high as the bloggers with their 5 entrees - and could be 20-30% tippers by default. But those big spenders and tippers could shave some tip off their meal if they were annoyed by yappy live streamers throughout their meal and the waitstaff expressed indifference.