This isn't about lifetime licences but more untrustworthy companies and clearly unsustainable business models in the LT deal. You have to think critically.

I've bought quite a few lifetime licences from AppSumo etc. over the years the vast majority have been above board, and some have even given extra bonuses years down the line as a thank you for supporting them in the early days. Some get bought by bigger companies and you can flip a coin what happens - shout out to MooSend and Archbee as they're remained great after being bought out/got investment.

Some companies also respond to bad PR when they bait and switch; Miro killed my LT licence until I complained and referenced contracts, BotStar is persisting after AppSumo kicked up a fuss and another whose name escaped me backed out of bait and switch after PR threats.

Some do just sadly die though.