Yes, but bitcoin is something of an outlier there.. I realize the "top 100" cryptocurrencies by market cap isn't necessarily very meaningful, but like 90% of those are proof of stake, including ethereum, which is the second most valuable cryptocurrency, and actually more widely used than bitcoin in terms of transactions or number of unique wallets.

is it the most transacted? And it's share of transactions has gone down (from being the only choice to lots of choices)

Largest market cap, yes, but also lots of probably lost coin.

One source shows Tether having the most volume, and it's very energy efficient to make coin out of thin air.