The problem there is users cannot evaluate if it matters to them whilst all information needed to do so is being witheld.
If having your personal email exposed would be a matter of personal safety or similar, then stop using it. If you're just using it for junk mail or to get a free trial then keep using it.
If having your personal email exposed would be a matter of personal safety or similar, then stop using it. If you're just using it for junk mail or to get a free trial then keep using it.