I do kind of like the idea of alternatives to a completely free plan, like pay a few bucks once to be able to use the basic plan forever with low limits etc. An

I do kind of like the idea of alternatives to a completely free plan, like pay a few bucks once to be able to use the basic plan forever with low limits etc. Another one I've seen that I like is to allow free use with registration, but you have to register with an email address at your business domain, no free or public commercial email domains allowed.