If it is illegal in your nation, if you or any other people try to use VPN to bypass government restrictions, there is risk that you will be caught, arrested and have big legal problems with government. So using VPN to bypass government restrictions must be considered and used very carefully.
Use a privacy-focused, no-log VPN if you are afraid of getting into trouble with your government. They can't request information about the sites you have visited if there is no information to be requested.

Besides, state nations have better things to do than to investigate people who viewed posts on X.
Not only for promotional but I have never received any email from Earnbet including when they added sports. Normally most other gambling sites inform their players by email when there is something new in the site, some casinos even inform players when they have just added new slot games but seems Earnbet is different.
There is also no option in the profile settings on the website to enable email promotions, to sign up for a newsletter, or something similar. It's clear that it's not EarnBet's priority.