Clients who are wary of online transactions are liable to see escorts with print ads as less likely to cheat or scam them.
Drinking ages are higher, drunk driving laws are stricter, bars are liable to punishment for serving minors, etc.
They can just steal the wealth and walk away, leaving a Superfund site behind them, and no one is liable.
mid-15c., "bound or obliged by law," probably from Anglo-French *liable, from Old French lier "to bind, tie up, fasten, tether; bind by obligation," from Latin ligare "to bind, to tie" (see ligament). With -able. General sense of "exposed to" (something undesirable) is from 1590s. Incorrect use for "likely" is attested by 1886.