Tiny white bugs all over the lid of my worm bin, are the worms in danger Worm Bin

The jumping ones are springtails and the crawling ones are almost certainly mites. Both are normal bin fauna and neither hurts worms. They're decomposers doing the same job as your worms on smaller material.

That said, an explosion in numbers is a signal. Springtails and mites both boom when the bin is too wet and too acidic, and "a lot of fruit scraps" is exactly how that happens. Fruit is wet, sugary and acidic.

What I'd do:

• add a good handful of dry shredded cardboard or coir and mix it into the top few centimetres
• lay off fruit for two weeks, feed veg trimmings and coffee grounds instead
• a sprinkle of crushed eggshell or garden lime raises the pH a bit, which the worms prefer anyway

Populations settle back within a couple of weeks once it dries out.

Check the drainage while you're in there. A lot of plastic bins come with drilled holes that block with fine castings after a few months, and then the bottom third turns into a swamp without you noticing. Tilt the bin and see if liquid moves.

Trick for pulling numbers down fast: put a slice of watermelon or a damp piece of bread on the surface overnight. In the morning it'll be covered in mites, and you lift it out and bin it. Repeat a few nights. Doesn't fix the cause but it buys you visible progress while the moisture comes down.

Quick way to tell mites apart if you're worried: brown or reddish mites clustered in a dense mass directly on food are worth acting on, because at high enough density they compete for the same food and stress the worms. Scattered white ones are just part of the ecosystem.