Is there any specific reason why you're not accepting deposits from the US anymore?
There is not much to explain I guess,just the US laws.If you wish to read up on the topic,I found an archive :
https://archives.fbi.gov/archives/news/stories/2007/june/gambling_060607tl;dr you can gamble your life out at Vegas Casinos in America but it is illegal to gamble online especially if the gambling website is located outside of the US.
Will you be banning Belgian IP addresses too? AFAIK Belgian law also prohibits unlicensed casino's (unlicensed in Belgium) to offer their services to Belgian citizens.
That could be the case but it is least of their government's concerns.As far as I know they're okay with it only under one condition,
the main restriction lies in minimal age limits to enter premises or to participate in gambling activities.
There are more requirements to be allowed to open up online gambling services to Belgian citizens.
This site sums up the gist of it, though it's not an official website:
https://www.gambling.com/country-overviews/belgiumBelgium manages this balancing act largely thanks to the introduction of the 2009 Gambling Act, which officially made them one and the same. In order for a company to provide an online gambling service in the country, such as online casinos, they must also possess a licence for a physical, brick-and-mortar operation. The government has kept a limit on the licences that can be granted, which makes it particularly difficult for new countries to comply with these restrictions. However, there are ways to circumnavigate these laws, as the case of bwin.party highlighted. Initially black-listed for being online only, the company was later granted a licence by partnering with the Belgian based Casino Kursaal Oostende NV.
This source is a bit more thrustworthy:
https://iclg.com/practice-areas/gambling/gambling-2017/belgium 3.1: Does the law restrict, permit or prohibit certain online activity and, if so, how?
Online activity is restricted, in the sense that a licence is required, and the required licences can only be acquired if the applicant can link his online activities to a ‘real life’ establishment that has the appropriate licence.
I could also give you an excerpt of the Belgian book of law, but it's only available in Dutch, French or German.