Felix Zwyer was one of four referees who went to the DFB with their suspicions about Robert Hoyzer, who was subsequently convicted of manipulating the results of at least six games, banned for life from all football and jailed for 2.5 years. Zwyer was only banned for 6 months, and we of course don't know the full circumstances behind what he did. It was run by a Croatian gambling syndicate linked to an OCG, so perhaps there were theats against him or his family. The fact he wasn't prosecuted unlike Hoyzer, and was given such a short ban, would suggest both football and legal authorities were satisfied he was just caught up in it.
In any case, he went onto get promoted to referee in the top division and then FIFA, and is one of the top referees in world football. I rate Bellingham, but he has made a massive mistake here and is going to be in real trouble. Not just from the football authorities, he could potentially face legal action should Zwayer choose to take things further.