Ring Signatures only apply to senders and grow exponentially with every transaction you make (and are randomly chosen for) 16^N, N=number of transactions. At N=3 you already have an anon set of 4,096 and that grows over time without any further input required from you.

Receiver anon set is every Monero user that has ever existed thanks to Stealth Addresses

For Bitcoin both your sender and receiver anon set is only as large as your coinjoin peers and very few Bitcoiners coinjoin let alone every transaction