To each her own! The most common issue is that you have some idea you start working on (T=0), put it away for a while (T=3 months), and come back to realize your free trial has expired. Alternatively, if you're just tinkering in the background or on weekends, 60 days is suddenly just 9 weekends.

What if you have one idea, and then another one 6 months later?

A product like ours (ML based medtech) takes a lot longer than 6 months to validate - and we make extensive use of GPUs (both AWS and Google)

Ideally perpetual free tiers are the best, especially their usage becomes a rounding error.