If you look into the fine print, "lifetime" or "unlimited" really means "until we change our minds".

Thus it's meaningless. Put "lifetime" or "unlimited" into a pricing plan and the one thing I know is that neither I nor the vendor can think rationally and honestly about it at all.

Thus it is a reason to look for another vendor who shows signs of realistic planning. If I can pay $50 for something that costs them $25 and it is obvious that it is roughly like that, I know I am partnering with a 'sustainable' business.

Seems like pretty realistic and sustainable planning to me, they give you at most 50 cents of credit to see if it works for you without a forced time limit.

You might have a point with general lifetime pricing plans, but in this case, I think the usage above of "lifetime free credits" was perfectly clear to most (and is in fact, limited).

That's why it's just better to have time-based pricing, like a monthly subscription. As long as you keep paying, you'll be able to access it.