Selenium is a “driver” that controls browsers, you would need some type of software to actually drive it. If you have programming experience it’s pretty easy to get going.
Personally, I use it in Ruby on Rails development for unit testing but I also use it to log in to websites and perform some actions on behalf of a user (where the websites don’t offer an API).
I don’t have experience with the others, but thought my comment may or may not be useful.
I use Apple devices for end-user activities but Linux for my routers and servers. I grew up with Windows at home and Macs at school; as a teen I used Linux full time on used PCs but always loved the “it just works” design of Apple gear.
I actually prefer FreeBSD, but Docker and containerization have brought me much closer to Linux.
Specifically, I love using Alpine Linux due to its flexibility. Its packages are very up to date and I can install an actually working Node or Ruby with a simple apk add versus installing nvm or rbenv. It’s awesome for lightweight, no nonsense stuff like Tailscale, VPNs, etc.
I mean, it’s still good to know if you’re vulnerable right (for sake of discussion)?
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I’m a Ruby on Rails developer and it’s been a decade or two since I’ve used PHP, but why does it want so much memory? We host Drupal-based apps in Kubernetes at work and they need nowhere near that much memory.
I would probably investigate what library or piece of code is requesting so much.
I probably can’t be of much help yet unless for some reason you want to take up programming. I’m just not familiar with web scraping outside programming.