Interesting response to this by UK ISP Andrews & Arnold: https://www.aa.net.uk/etc/news/bgp-and-rpki/
They deserve to be called out for this. It’s not hard to implement RPKI. Only valid excuse is if your routers don’t support it.
Signing ROAs is trivially easy in the RIPE region. Why haven’t they done so before the pandemic???
Wasting time with this response instead isn’t maybe the best use of their time.