As per D&D Rules will Lycanthropy only transmitted with a bite attack. This is there that the DM can keep control of who will be in infected in the party and for the werebeasts to control themselves who will be infected. The lycanthropes of Barovia for example are usually under Strahd's control (who, in most iterations likes to toy with adventurers in his free time), so one could see that they have got the order not to spread their infection.
A good example for how Lycanthropes deliberately hold back on their bites (they even must be in their hybrid form, so knowing of their infection and willing to spread it) is how wereravens will go to great extent to never use their bite in battle as they are controlling very tightly who may become a wereraven.
So we could say that Lycanthropes usually avoid adding randos to their pack and that if a PC becomes a Lycanthrope the infection was deliberate and no accident.
Given Whitewolfs addition consider their theology as Garo do not intentionally spread the infection and generally those feral do. Those that fall to the madness are nothing more than Evil Garou in almost lost control or have fallen to the Beast amd there fore no control.
Regardless it can be well story driven. And I see the views of both sides. One you have people who would purposefully try to become infected to have a chance to be a MPC rather lwtting it bw request or chance. And the other you have a legit roleplay potential that offers a narrative development if taken responsibly.
Sadly we seen how some these auggestions and debates go. So I don't habe confidence we'll handle this well. As a former DM from servers such a feat can be rather difficult to maintain. I know th3 same story od not putting more on Dms but management and quality control is not an easy task.
So I offer this as a medium and suggestion. We do not possess Taint scores in this Ravenloft game. But, we do permit Dark Power Checks. First example would be to augment the transmissible race to have a low % on contact with a viable target to drop a plot token (Curse) upon success of transmit. X amount of Curse causes minor Symptom IE lunatio madness. (Non-remove as per feats.) At tgis early stage a player should be reponsible to roleplay this out in game and on forum. Dm checks or finds roleplay, checks play inventory for X amount of (Curse) Tokens., makes player perform dark power check. Succeds tokens are removed but Lunatio remains as side effect. And/or Remove Curse is scripted to remove token or by Dm viewing. If failed the target player aquires a Dark Power fail and resumes Curse Rp. If like most CC requests this would give premise to consider a MPC request which then falls on the CC to advise leaving Dm involvement minimal less target player resumes rp recieving DP Checks.
This is just a make shift example. I never experience what happens after so many DP Checks but this would fit along our system. Even with out the token mechanic this can still be roleplayed with a CC request/suggestion. The token Curse system would make it so those things transmissable would apply a further sense of concern some players may or may not enjoy. Just bare in mind with some resources and addition to D&D and Whitewolf inclusion most of these creatures are free willed and are aware od their curse and would not spread it out of a shred of humanity, responaibility, or simply do not want the burden of another in their midst. For those with no control I feel it is more story driven by a DM or Storyteller as a High Risk event. Given the rules we cannot rp or control the actions of NPCs, Monsties included, it would be a potential rule break as well. Though I don't totally agree it would l. On the grounds of the rules in place and the mechanics viable still be best to consider the ask CC/DM option.
Then again a player could pull a Voracious and build a story to LYCAN Curse via Lunatio. It be up to the player to provide solid rp with a party, get CC involved and a Dms interest which isnt most likely but a possibility.
Right hope this helps in some way.
Toodles.