I don't know about Lichess, but chess.com changed their distribution. Rapid average was around 1100 just a few years ago. Now it is 614. This has caused many players who have been on the site a long time to have their ratings drop along with the average
Comparing percentile ratings between sites
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My blitz rating puts me nearly 87th percentile at 1150 plus or minus.
I see discussions on rating numbers but not percentiles. Which site has the stronger typical player? Seems percentile rankings are a better comparison.
1150ish here would by percentile rating be over 2000 at lichesd.