Just looking at the name of the app, it appears that the developer didn’t ask anyone about branding or marketing prior to release. “Authenticator App”? Search the App Store for something like Authy and you only get one entry with anything close to that name. Sometimes helps to be unique and trademarkable.
Just to see something, let’s try searching “authenticator app” on Duckduckgo. No hits for 2Stable on the first page. Is that because Google and Microsoft are that much better? Or just because they’ve been around for longer and have more exposure (and their app name INCLUDES the company name)? Going down further, you see results that include a couple BEST AUTH APP 2022 articles, where “Authenticator App” doesn’t make the cut, and links to other authentication apps that aren’t as old as Microsoft and Google, but still, no “Authenticator App”.
UNTIL, interestingly enough, you get down to links to news stories about the developer’s complaint. Now, I’m just an old country rooster, but when news stories about your complaints have lapped your earnest effort to get your name out there, there was certainly some error in the marketing strategy. Unless, of course, this complaint is a part of the marketing strategy?
Because, if it is, NOW would have been a GREAT time to pick a better name for the product… maybe “2Stable Authenticator”?

At least then, as they’re getting ALL this free publicity, that unique term might find it’s way higher in the internet search results in the long run.