Yes, your house will be on these and other portals. However Realtor.com & Zillow make their money form Realtors. They sell zip codes to agents for leads from buyers looking in those areas.
What Does This Mean?
Customers looking for homes won’t be able to contact you direct. If a buyer requests information on your house, an agent that has paid for that lead will get that contact info and try to work with that buyer. The leads don’t come to me or you.
The Bottom Line
These portals are great for providing increased exposure and getting your home sold. But the buyers using these services are most likely going to come with an agent. However, frequently, they see the home online and drive by first. So, you CAN capture the drive by traffic generated by these sites. They will be able to get your phone number from the yard sign.