I migrated from pinboard to raindrop this year, can confirm.

I was on Pinboard's lifetime plan. No subscription, just a single payment of $15 back who knows when. A few years ago I was asked if I wouldn't rather pay $5 per month instead, and declined. I wonder if all the outages and throttling were a result of underestimating the running costs.

Regardless, service quality had declined to such levels that I switched to raindrop this year. Ironically, raindrop is free to use, and may run into the same issue eventually.