EDIT: Reconsidered my previous point.
I can remember when they removed the charge for literature.
In the UK, initially we were specifically told NOT to say the literature was "free", but to say it is offered "without charge". Were advised not to solicit for donation, but if anyone did ask how it was funded, we should say it was by "voluntary donation" that goes towards printing more literature.
I presume the very strict wording was in order to comply with UK HMRC regulations, as soliciting for funds would presumably be illegal without some kind of trading licence.
Gradually that all faded away, and frankly hardly anyone ever asked or asks how JWs or the literature are funded anyway. Now, JWs are forbidden from accepting any cash donations on house-to-house or at the carts, and are told to direct "interested" ones to pay online if they wish to donate.
The irony is that this now causes more awkwardness, because the few people who might wish to give a small donation just want to give a few pennies or a pound from their purse/wallet, not go through the hassle of signing in to a website and paying by credit/debit card. I've been in a couple of embarrassing situations where I've had to insist I couldn't take someone's well-intended money because of this rule, despite their desire to actually contribute something!
As a result, I presume the Org gets pretty much nothing from "the public" anymore, hence all the nagging about donating directed at members of the congregations these days.