Fossil, Garmin, and (to an extent) FitBit work in different market segments to Apple and Google. Fossil leans heavily on its brand value and aesthetic, while the other two are more fitness centric. The Apple and Google entries are general purpose tools.
Pebble was a different market segment too. Pebble was a low cost, long battery life device. There still isn't anything remotely like the Pebble Time on the market right now. I literally went 2 years looking for a similar device after my old Pebble died and couldn't find anything before giving up and buying an Apple Watch. I do like my Apple watch but honestly, I'd rather have had a new Pebble Time.
There are, Withings makes them (I have another comment you can find on this, don't want to sound like a shill), but there's no ecosystem at all, so the Pebble sweet spot is still unclaimeed.
Yet there still isn't any a) good looking watches with b) great battery life. There's still room for something Pebble-like.