I think it’s a very good thing it exists. Viruses (and by extension, Anarchs) had just completely insane lategame power (see: any runner deck splashing red cards in the last 3 years), and completely neutered some of the more outlanding corp builds. Providing a counter opens up the design space for giving Anarchs more power elsewhere.
It’s also a very interestingly done card, in my opinion:
- the interaction with a deep Medium dig is interesting (whether installed, or revealed from RnD)
- the insta-speed wipes are also interesting (and appropriately costed)
- last but not least, it’s mega-annoying in Archives, enough to make me consider Archives Interface in a dedicated Parasite deck
So, yeah - my personal opinion is, the answers to both of your questions are a resounding “yes”.