The cost of switching to an unfamiliar Interface and workflow is high enough, charging money to do it will further increase the barrier to entry.
Paying for open source software sounds good on paper, but if it is required, the software will never accumulate the users to make the development have any meaning.
There has to be a "try it before you buy it" too. Otherwise the permutations of scams are obvious and nobody will fall for that. Idk how you would prove that the software works, without giving an actual copy of the software.
Also, legalities between different countries. You will just not get your money back from "trustworthy nigerian software dev who just needs 50$ to give you some software".
So no.
Do donate if you can though. If you value the software you use, you will pretty obviously recognize the utility and the cost to you, should it go away.