This is a tough one to evaluate because msging.net currently returns a 404 error — there is nothing on the page. That alone should make anyone pause. A domain that has been registered for nearly 11 years through GoDaddy but has no content, no contact information, and no about page leaves too many questions unanswered.
Most legitimate websites, even small projects, give you some way to identify the people behind them. Here, there is no branding, no social media links, no privacy policy, and no terms of service. The site is not on any blacklists and has decent technical security, but that does not matter much when the site itself is empty and anonymous.
If msging.net ever comes back online, the main things to watch for are transparency. Does it clearly say what the service is? Does it provide a physical address or working contact method? Does it have a privacy policy? Until those basics are in place, treat msging.net with serious caution. There is not enough evidence to call it a scam, but there is also not enough evidence to trust it with your information.