When I was freelancing I quickly refused a lot of potentially well paying jobs because of the requirement to use such monitoring software (their loss imho...). I don't have a problem with video-chatting with an employer about anything, or even with a temporary screen-share during a testing task or interview process, but having my actual work monitored like this felt like a total invasion of "my space".
I don't know about you, but doing it this "big brother-ish" way feels very demeaning and I refuse to work for people that treat me like that and I hate it that it's starting to become a "standard" nowadays, at least for "low level" work.