If you didn't post it here I would never click on something called "freeoptionscreener" . I would just associate it with all the junk/border line scams that infest the world of retail trading, especially retail options trading.
I would also say that I expect to pay something for quality in this space. Even if free I wouldn't mention it. It has a discount sushi feel.
There are plenty of respected sites in the finance and options space with names like this. The reason it works is because the ad space itself in this niche is so valuable.
Where I agree with you is that it would turn me off when this inevitably becomes a SaaS product, and I would be turned off by the freemium aspect, while expecting it to have some kind of annoying freemium gimmick. The dangling of "Free" in the service's name would just make me expect that more. Currently I am pleasantly surprised that it actually is free, if I had randomly come across it on Google I would be pleasantly surprised as well. In the past, Tradier API was not available and services couldn't be free because the data was so expensive.
There are other criticisms possible, but they're in other comments.
Replace banana with your favorite fruit.
You're welcome :D