You got what you saw: unlimited use of the WordPress plugin. I don't even see mentions of any guarantees about updates -- but as long as they maintain the plugi

You got what you saw: unlimited use of the WordPress plugin. I don't even see mentions of any guarantees about updates -- but as long as they maintain the plugin for say 3-5 years or so I think the "lifetime" claim is perfectly valid. The SaaS app is an entirely different product, as evidenced by the fact you're saying it even looks different. It also has a different business model. If you buy a finished product you don't normally expect new features to be added if it's not on a subscription model. If it's explicitly "early access" or "beta" software you might reasonably expect it to be polished and maybe get whatever features it is currently missing (if they have been advertised or are obviously necessary for it to fulfill its advertised purpose) but a finished product is a finished product. My understanding of a plugin being sold with a "lifetime license" would be that I get any updates to that plugin for free but that that won't include new "major" versions. Similar to how if I paid for MS Office 1997 I wouldn't expect that to mean I also get a free "upgrade" to MS Office 2000. If you saw enough value in the plugin to justify the purchase and keep it past the 60 day no-questions-asked money back guarantee, there's frankly no reason to be upset unless they stop providing security updates or no longer maintain the plugin for compatibility with newer WP versions. Would you be equally upset if they never released the SaaS version but still stopped adding features to the plugin (while still offering security and compatibility updates)? If not, what difference does it make they now also offer a SaaS product? You bought a software product and an implicit guarantee of keeping that software product in a working condition. You didn't buy a team of developers continuously working on improving that product and adding new features.