Here’s what consumers have asked with answers from Nobuna staff and previous consumers.
I bought a subscription with them and later realized they download their plugins from https://prowebber.ru/ and later sell at a fee on their site. I asked for proof of purchase of the plugin but they were unable to produce it. Stay away from them
Nobuna has legit copies and most plugins they offer are the most popular and well maintained plugins. They are all open source, so there is nothing to hide. Obscure plugins and ones that are not well maintained are not the type on Nobuna. Regardless of the source, anyone who is trying new plugins needs to have a staging/development site that they test new plugins on. Otherwise hire someone who is experienced and can do this for you. You should never put a new plugin on a live/production site directly unless you do not care if it goes down.