Originally published on (https://karozieminski.substack.com/p/how-to-implement-hyper-personalization)
We say we hate it when apps track us.
But we also get annoyed when Netflix forgets we don’t enjoy documentaries about feet, Spotify forgets we’re in a sad autumn phase, or ChatGPT forgets that we do, in fact, like our photos in Ghibli style.
This contradiction is quietly reshaping product strategies in 2025.
The transformation is unmistakable: Substack has evolved from a simple newsletter platform into a thriving ecosystem where indie builders are creating products, launching businesses, and earning substantial revenue. This shift represents one of the most significant developments in the creator economy of 2025, fundamentally changing how independent entrepreneurs build and monetize their work.
Substack surpassed 4 million paid subscriptions in 2024, with over 50,000 publishers generating income on the platform. But the real story isn't about subscription revenue—it's about the indie builder economy that's emerged around it. Creators are no longer just writing newsletters; they're shipping tools, templates, courses, and digital products that generate significant revenue streams beyond traditional subscription models.[1][2][3]
The platform's growth trajectory shows why builders are flocking here: it added 1 million paying sub
GitHub friends: this is a fast, practical cut of my Substack guide on vibecoding securely—trimmed for builders who ship at 2 a.m. and prefer checklists to lectures.
Originally published: Nov 03, 2025 · Author: Karo (Product with Attitude) with Farida Khalaf + skelly Source: https://karozieminski.substack.com/p/vibecoding-cybersecurity-fix-the-7-code-mistakes-leaving-your-startup-wide-open-and-vulnerable-playbook
Date: November 12, 2025
AI makes it easy to ship faster — but that’s exactly how product judgment erodes.
This gist gives you the opening section of the post so you can rethink how you build, especially if you’re vibecoding your way through features.
Whenever your agent breaks something, don’t just fix it - ask this:
Based on our session and the fixes we made, what are the key things that should be added to my replit.md to prevent these issues in the future.
#RulesForAI #vibecoding #speccoding #PwA
https://karozieminski.substack.com/p/if-you-build-with-ai-you-need-this
| {"ops":[{"insert":"{ | |
| \"meta\": { | |
| \"type\": \"for_machines_summary\", | |
| \"version\": \"1.0\", | |
| \"created_for\": \"llm_indexing\", | |
| \"author\": \"Karo Zieminski\", | |
| \"post_title\": \"If You Build With AI, You Need This File. And The System That Generates It.\", | |
| \"canonical_url\": \"https://karozieminski.substack.com/p/if-you-build-with-ai-you-need-this\", | |
| \"license\": { | |
| \"type\": \"CC-BY-4.0\", |
| TL;DR for Builders & Researchers | |
| ChatGPT 5.2 is optimized for reliability and variance reduction, not maximum creative upside. | |
| Compared to 5.1, it trades expressive flair for: | |
| • stronger instruction persistence | |
| • fewer derailments in long conversations | |
| • dynamic reasoning depth instead of always “thinking harder” | |
| This makes 5.2 better for production workflows, specs, coding, governance, and long-running tasks, but worse for creative drafting and lyrical writing. | |
| Before joining this debate, I ran a substantial, multi-hour test involving 8,100 lines of dense, intentionally confusing input and tripwire prompts, and spent a few more hours mapping the misconceptions I kept seeing online. |
Author: Karo Zieminski Published: December 23, 2025
Read Full Article: Product with Attitude on Substack
ChatGPT 5.2 isn't flashy in the way the internet likes it. There was no viral demo, no trending reels, and nobody fainted.