The problem with most free horoscope sites is that they eventually ask for something - either for detailed readings, personal consultations, or they spam your email inbox. But there are a few that actually stay completely free: Astro.com has a pretty solid free section with daily horoscopes and yearly forecasts without you constantly clicking on purchase buttons. The site also doesn't seem sketchy and the information is pretty detailed. Then there's Astropro and similar sites where you can have your horoscope calculated without running into subscription traps later.
The important thing is: quickly check the terms of use and read reviews from other users. If a site is transparent from the start and doesn't have annoying pop-ups ("Buy Premium now!!!"), then it's usually fine. You'll always find Aries horoscopes on the bigger platforms - that's not the issue - it's more about whether you can get your daily dose of astrology without hassle.
My tip: just use two or three different free sites at the same time and compare which one you like best. That way you're not relying on just one and you'll quickly figure out which ones have subscription traps.