This topic comes up from time to time, and I understand, this isn't for everyone. I've made it so you can use it for free, with only a periodic prompt to register.
The Monokai Pro packages for Sublime Text and VSCode go beyond a simple set of colors. They offer UI theme customizations, multiple filters, easy switching between themes, and a custom icon pack, all designed to work together. Maintaining this takes ongoing effort to ensure compatibility with new UI elements and syntax changes as these editors evolve. In return, I ask for a modest fee to support the work involved.
You likely spend far more on far more transient things. Why is it okay to spend $5 on a coffee that's gone after ten minutes, but not $12 on a font you'll use daily for years?
The coffee is a tangible thing that required a lot of work to produce and deliver to you, and this work is required again the next time you want a coffee. The colorscheme is #19181a, #221f22, #2d2a2e, #fcfcfa, #ff6188, #fc9867, #ffd866, #a9dc76, #78dce8, #ab9df2, #c1c0c0, #939293, #727072, #5b595c, #403e41.
I don't use the official Monokai Pro theme, I use a remake of it for Nova editor. But I still paid the Monokai creator as imho they have earned it. Pay it forward.
You may not be alone, but I have donated to Prot for the amazing Modus Operandi colour scheme. If it's something you really like, why not support the creator to try and encourage them to make more things you like?