Polygon (MATIC) Cardano (ADA) was deleted and Solana and XRP were kept. The thinking of these institutions may be beyond the information available to us, but deleting MATIC may give a negative signal to investors.
I think it is the other way around, the signal from investors is what triggered the deletion, looking at ATH, XRP is next
Polygon -83.2%
Solana -46.9%
Cardano- 88.3%
XRP -87.3%
I think we're entering a 3rd cycle, probably a new wave of coins that were all the rage in 2021 are going to end up forgotten.
NEM, Waves, Dash, Eos, all went like this, every cycle there is a clean-up in the top 10 top 25!
I would bet avax and chain(link) are next.