Does Bitcoin work for tiny amounts (eg $5)? Last time I looked (years ago) it cost like $25 do do any BTC transaction at all.
Bitcoin has had periods of high network load in the past but as of late the fees have stayed relatively low. Currently the cost for a single transaction usually falls between $0.1-0.4.
It depends on the wallet but it is possible now. There is a layer 2 protocol called lightning. People are sending people sats all day over Nostr.