Napoli in Serie A, then Southampton in Premier League. What leagues and clubs will be next partners of Rollbit?
La Liga, Real Madrid. 
It will be a good match if Rollbit become a main sponsor for Real Madrid since Rollbit and Real Madrid use the same color: white, yellow and black. Although it's almost impossible since Real Madrid have many big sponsors.
Months ago, news is like these types of advertisement will be banned soon. So are there any updates and changes in regulations recently?
They said the ban will begin in the next two years.Quote from: https://www.premierleague.com/news/3147426
Clubs agree to withdraw gambling sponsorship from the front of their matchday shirts, the first UK sports league to do so
Premier League clubs have today collectively agreed to withdraw gambling sponsorship from the front of clubs’ matchday shirts, becoming the first sports league in the UK to take such a measure voluntarily in order to reduce gambling advertising.
The announcement follows an extensive consultation involving the League, its clubs and the Department for Culture, Media and Sport as part of the Government’s ongoing review of current gambling legislation.
The Premier League is also working with other sports on the development of a new code for responsible gambling sponsorship.
To assist clubs with their transition away from shirt-front gambling sponsorship, the collective agreement will begin at the end of the 2025/26 season.
Premier League clubs have today collectively agreed to withdraw gambling sponsorship from the front of clubs’ matchday shirts, becoming the first sports league in the UK to take such a measure voluntarily in order to reduce gambling advertising.
The announcement follows an extensive consultation involving the League, its clubs and the Department for Culture, Media and Sport as part of the Government’s ongoing review of current gambling legislation.
The Premier League is also working with other sports on the development of a new code for responsible gambling sponsorship.
To assist clubs with their transition away from shirt-front gambling sponsorship, the collective agreement will begin at the end of the 2025/26 season.