It is normal now, I deal with CVs all the time because I work with students for career development and advise and most people take certificates online from MIT, Europe, etc. It will raise eyebrows only if you have no traditional education but only degrees from online places. It is perfectly valid if you hold at least one degree from a local school and then have a section in your CV that you can call "Continuing education" and put there all your EDx, Coursera, ENEB, etc degrees and certificates. I know people that work in coaching and natural medicine, they never went to a formal school and most of their education comes from online sources and practice as coaches or natural medicine practitioners. The customer is not going question that their education came from ENEB, coursera, etc, they only go with them by referrals and reputation.