DON'T waste your time
In addition to the already mentioned fair, I also point out that it's nothing more than (let's just politely say) 'not very popular' types of programmes (in ANY language).
Even though the person who's review is posted for all to read as being terrible, posted '4 years ago' (2019), - to which the app-maker replied for them to use a 'faster connection', I'm using THE fastest connection available in late '23, so my 'don't waste your time' has NOTHING to do with lag, but, what the app purports to have, and what it delivers.
Response from developer
We are very sorry to hear that. However, we permanently expand the number of supported channels in every next version - please, always follow the current app version in App Store