The free tier is the thinnest here — 150 words a month, 80 per request. That is a demonstration rather than a trial, and it is not enough to form a view about the writing.
The marketing is the other reason people move. BypassGPT advertises getting past specific named detectors. Detectors change without notice and disagree with each other on identical text, so that promise is about systems the vendor does not control.
A third reason, quieter than the other two: at 5,000 words a month the entry plan is among the smallest paid allowances in this set, and it sits at $12 a month — more than Humbot or Walter Writes charge for several times the capacity. People usually notice the free tier first and the paid arithmetic second.
None of that makes BypassGPT a bad tool. It makes it a tool with a shape, and the question is whether that shape matches your work. Our full HumanFlow vs BypassGPT comparison sets its numbers against ours in detail, including where BypassGPT wins.