foss is about a lot more than not paying.

It's about trust, being able to know what software is doing. That is in the source-available part. I can never be as certain a pirated (or legitimate) binary blob isn't secretly leaking telemetry or documents off my system, or doing anything else of the infinite things I dont want software doing.

It's about safety, from poor decisions and hostile decisions. If my foss software is enshittifying, I can use a fork, which can be created with comparatively little effort and can still otherwise track upstream. With proprietary software I am completely fucked, and with a pirated version best I can do is continue using the old version, being locked out from any new features I do want.

It's about security. Both in the sense of the trust benefit knowing there are no intentional backdoors, and in the bug sense where foss simply does better in identifying vulnerabilities before major malicious actors do.

Our modern world and especially proprietary software fucks you in plenty of ways, and most of them aren't an easily visible price tag. More and more software corporations are earning most of their money from spying on or abusing the users of their software, even for paid software. This money is spent on doing things to the users they would never want, otherwise why would you need to pay? It is money they will earn back when you get denied health ensurance based on your unreleased draft of a book you were writing that chrome sent to googles servers for "virus scanning", which the insurers ai flagged as a mental health risk indicator.
I recommend you don't participate in the global expetiment of how much intransparent software can ruin your life.