They likely traveled across the globe on shipping containers, similar to the Bubonic plague.

This caught me.

Their life cycle begins in early spring,* but they get big in June and are often seen in July and August.*

They become a big deal when things get hot.

They're named for Jorōgumo, a creature of Japanese folklore that can shapeshift into a woman or spider before killing its prey.

https://yokai.com/jorougumo/

This is the "whore" spider.

the beautiful jorōgumo are also famous for the cruel destruction they wreak on young men.

Jorōgumo’s favorite prey are young, handsome men looking for love—or other favors. When a jorōgumo spots a man she desires, she lures him into her home with promises of affection. He is never seen again.

https://www.wbur.org/npr/1084692989/beware-the-joro-spider-scientists-say-the-giant-but-harmless-arachnid-is-spreadi

But don't worry too much: Joro spiders are harmless to humans — and even do some good.

"People should try to learn to live with them," Andy Davis

It doesn't sound like they are a danger to people.

https://www.insideedition.com/asian-joro-spiders-famous-for-parachuting-out-of-the-sky-expected-to-move-towards-the-northeast

Joro spiders, described to be as big as a ‘child’s hand,’ are expected to make their way towards the East Coast this spring. The spiders don’t only crawl, but apparently ‘parachute’ down from the sky,

Don't crawl (not brought by land borders) but are flown in.

They lay 1500 eggs. (start a lot of new things)

Though massive and scary looking, these creatures are apparently harmless to humans and pets, researchers say.

They look scary and monstrous, but they are of no danger.

“If they're literally in your way, I can see taking a web down and moving them to the side, but they're just going to be back next year," Davis said.

Taking down a website but a new one popping up?

https://www.freepressjournal.in/world/ukraine-invasion-hacker-collective-anonymous-launch-cyberwar-against-russia-taking-down-government-websites

It almost sounds like website disruptions in the summer. Perhaps referring to Taiwan and China. It starts in the spring, but won't become a big deal until summer.

Asian spiders will try to parachute into websites to spread misinformation and seduce people with lies, but they are overall not dangerous.

Just spitballing.