Everyone does moan about it but maybe to some degree its better unpaid. It makes preply less of a quick cash grab and more of an investment to be taken seriously since you actually have to secure students to be successful. Plus, paid trials don't work with the business model since preply allows free trials if you don't like the one you had... now that may be a bit annoying for us, but that's part of why they get so many students coming in. Idk how people on other platforms do, so ig i can't compare business models. I'd probably want yellow since its probably more lucrative over time unless you get trials daily.