I've bought 20+ lifetime deals on AppSumo. 3 or 4 are now dead, 3 or 4 were never usable, and I have no idea how long the rest will last. VivoMeetings is the latest.
I bought two VivoMeetings accounts — one for my own use, one for client calls. Both are gone. No migration window, no export path, no replacement offer. I found out when meetings stopped working, which meant scrambling in front of clients and moving everything back to Google Meet mid-schedule.
Checking the reviews here, I'm clearly not alone — other buyers report the same shutdown with no notice. I'm not blaming the concept of lifetime deals. But "lifetime" means the vendor's lifetime, not mine, and there's no protection once the refund window closes.

Rating: 1/5. Not because the product was bad while it worked — it was fine — but because it left without a word.