Not all free online
daily horoscopes are written by actual astrologers.
But there are indeed real and serious horoscopes you can read for free online.
Fake horoscopes are written and recycled by computers or in "horoscope factories" that give hired writers (college students) two or three hints and then tell them to make up the rest. If you want better,
see the list of real daily-horoscope astrologers below.
Every human astrologer has a different style and approach to chart interpretation and forecasting. Listed below are genuine and hard-working astrologers. I've talked with or emailed some of them. They might have help charting and organizing 12 horoscopes a day, 7 days a week, 365 days a year, but real astrologers will openly admit when they have a co-writer and will proudly acknowledge the co-writer's participation.
In alphabetical order,
here's a starter list of online legitimate astrologers known to me to be real people writing original daily and/or weekly/monthly forecasts, whose forecasts are free and written in English. The links are to their columns, not necessarily their homepages.