3. It's not about whether it's difficult to act as an IPFS node, it's about whether doing so will (in the future) bring you under legal scrutiny the same way running a node serving copyrighted content on the Bittorrent network will do now. DMCA against the major gateways will probably work to make files difficult to access, and IPFS necessarily reveals the IP address of the node you connect to, if you don't reveal a gateway. Similar techniques are used to get the IP addresses of Bittorrent users, and send them demands for financial compensation or sue them in court for distributing copyrighted material. If the same becomes common for IPFS, it would not be unlikely to see college networks come under pressure to ban access to IPFS, and this would limit access to LibGen's database in a significant way.