Invites from users and spam.

A completely common and natural way to promote a site is to provide its user with the opportunity to invite new participants from outside. At the same time, to stimulate this inviting activity, the user usually receives a certain bun for each guest. Either these are percentages of something, if this site is tied up primarily for money, or these are some internal bonuses, or at least a rating. Naturally, this leads to the fact that to all the multitude and variety of spam, “invite” spam is also added when someone asks / persuades / demands to follow the link with his inviter code.

Results:
1) New users for the first time in their lives will get on our site by deception. Hardly they will linger there for a long time (if we are not talking about a “biomass” site)
2) Spam volumes increase.

What to do? To refuse to invite in general, to refuse from buns for invited participants, or is there any other way but a good solution?
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(it may make sense to transfer this topic to another blog)