I agree, their quality is sometimes questionable but to be fair OTA has preallocated/fixed bandwidth, while netflix on the other hand likely gains from optimizing for lower bitrates.
https://variety.com/2020/digital/news/netflix-degrading-hd-v...
Even if they are bandwidth constrained, I wouldn't be surprised if some shows looked better at 480i/.5Mbps than 1080p/.5Mbps.