Online television bundles are getting bigger and prices keep rising, edging closer to the cable bundles they were designed to replace and muddling the economic equation that has prompted millions of Americans to cut the cord.

YouTube TV, started two years ago as a lower-cost alternative to cable, said this week it was raising its monthly rate by $10 to $50 and adding channels such as HGTV and Food Network. T-Mobile US Inc., a wireless carrier that has been looking to jump into the video business, said it would start selling...