>>105194370That's the unfortunate bad side to GFE and ASMR content. It's a relatively easy and fast way to generate a following and income from lots of men without really having to be intimate with any of them and maintaining your privacy, but there's no easy way out. Generally GFE vtubers very subtly start steering their content away from it once they've reached a certain popularity where its no longer needed, but every fan has their parasocial line where as you say, they'll chimp out if its crossed.
This is literally the original point of idol graduations, it's the Japanese idol telling her fans that she loves them to bits and will cherish the memories and she remained single and loyal to them throughout her entire career, but as a woman, she now needs to move on and hopefully meet someone and start a family and didn't want to do that whilst she was active.