Some domain registers honestly play with fire, I hold some domains with Namesilo and never had issues but that doesn't mean it won't happen.
Similar things happened to me with SAV, close to a hundred domain names of mine won on THEIR auction got locked, and nameservers changed. Neither did I ever use the domain names on there but mostly used SAV for their auctions.
It could be anything from a "past history" of a domain name that gets you in trouble and there are also and this sounds like a joke but it's honestly a real thing that people open up a small shop and call it Selling shoes, then decide to put a claim on those domain names.
I am not even kidding check this out:
https://www.taftlaw.com/news-events...ay-com-against-reverse-domain-name-hijacking/
So the owner of Thursday (dot) com had to lawyer up against a rather new company called Thursday Boots as they claimed rights on Thursday, odd enough this case still doesn't sit well with me as they lost but that case is still all around the web, kinda putting a stigma on such an expensive and amazing domain name.
In my case, with SAV, I did end up getting legal help but it was purely a sum up of the damage claims we would potentially bring to court topping it off with a viral LinkedIn post and using Namepros.com, where btw also Namesilo is active to get all my domains released.
But it's still honestly a fucking joke as I had to fund a good sum of domain names to transfer out within a short period of time.
I honestly don't know anything about Namesilo in this regard but based on that email where it says you have to drop the disputes to release your domain names is absolutely disgusting.
Just keep in mind it's not that big of a company either, Company size: 11-50 employees.
Same with many and many other domain registers.
I know it's not worth bringing all this to court, especially if you are overseas and the fees add up but oh my fucking good, there will be one day they catch the wrong person with this crap and go bankrupt faster than they can email you with a simple sorry.