The risk of using products, for a live business, from AppSumo is so great now that it outweighs any potential benefits or cost savings from these "lifetime" deals.
I have experienced this multiple times in 2025 and had already cancelled the auto-renewal of my plus membership.
For a live business that can't handle the risk of software companies just folding a year or two after launch, don't bother with these Appsumo deals anymore. For the odd "diamond in the rough" you may find, it will cost you way more in many other ways, including wasted time replacing failed software/companies and, worst of all, a bad experience for your customers!