Well, there were various factors. I wasn't a complete beginner. I play drums and synths, dabble a bit with keyboards, know some basic music theory, can read sheet music though not in realtime, and have recorded my own music for years. I even owned a cheap bass about 15 years ago because I wanted to learn but I was fully immersed in synths at that time and ended up selling it. Eventually got bored of synths and decided to give another chance to bass, but with a full commitment.
Went to a few stores to try some basses with a budget around $300-$400 and after trying various basses I tried the Squier Jazz Fretless. At first I didn't realize it was fretless because it has painted lines instead of frets. When I noticed, I almost put it back on the wall thinking it would be somehow harder to play, but gave it a try and it turns out that the lines help quite a lot. It also felt better built than any other bass I had tried (Epiphone Thunderbird Gothic, Ibanez GSR-200, Stingray SUB-5, Squier Affinity P-bass). Asked for the price and it was considerably cheaper than most of the others, so that sealed the deal.
I've playing it almost every day since I bought it and most of the time I don't miss the frets at all. I rely completely on the lines because I'm still far from being a passable bassist, but don't regret my choice a bit and I expect to keep and play this bass for many years.
Hey, why not? No one's ever learned on a fretted violin in the hundreds of years they've been around.