Just found out the landlord doesn’t have a rental license [PA]

I made the dumb mistake of signing a lease with a landlord from a Philadelphia Facebook group. I toured the property, liked it, and then signed the lease with the landlord who is also the homeowner.

The thing is though, as soon as I signed it, the landlord has become dead silent in their communications. I asked repeatedly to forward me the contact information for the other tenants at the house (my future roommates) and he has simply ignored my messages.

That felt fishy to me so I did some digging and found out via the Philadelphia ATLAS service that they do not have a rental license.

So my situation is this: I’ve signed the lease and paid the security deposit. I want to break the lease and get my money back if it’s possible. Also, would it be illegal to share on social media about the landlord so I can warn others?

Any and all advice is welcome, thanks so much everyone.