When the Pirate Bay added support for Bitcoin donations in 2013, copyright holders were worried. In late April, The Pirate Bay came back online after more than a month of downtime and started using a new Bitcoin address for donations.
According to Torrent Freak, the website now receives less than $5 per day. Even if Litecoin and Bitcoin Cash donations are counted, which are much lower, the $5 barrier would not be reached.
In other words, Bitcoin donations are not the threat copyright holders envisioned early on.