It's around at a time of year when we're not looking for flowers but bees are. Big daffodils hog the attention and snowdrops too, but squill is there, pretty and quiet in the shade. It's the only blue flower I know of that also makes blue pollen.
Squill is out at the same time as the mat green maple pollen and it's often too cold for bees to fly when it's here. There must be thousands of times more maple trees but the bees faithfully bring in quite a lot of squill so they must like it.
When bees bring in squill they can build up strong before dandelion and fruit trees hit and they can field more bees for those crops. Squill and maple are a big boost early int eh season when bees have neither resources or numbers. It's an auspicious start to the season.