Please consider also describing the business model on the website, even if hidden away on a FAQ. I've so much subscription fatigue now, I just don't try things out if needing a subscription is an inevitability. I'm happy to pay for good products, just not happy to be forced to pay a fixed rate for continued access even if my usage dwindles.

If you are thinking of adding a one-off-donation-style purchase method, consider giving annual reminders to renew it. At least in my case, I'm not unwilling to pay repeatedly if development continues, just unwilling to make an upfront ongoing commitment.