LPG is not wholly a by product of the oil industry, it is the raw petrochem product for example from Qatar's gas reserves.
Quite logically here in the UK, IMO, LPG forecourt pumps will dwindle.
The targeted banning of ICE powered vehicles together with the decline in number of users buying significant quantiles of pumped LPG , makes the financial overhead costs of providing it at forecourts too costly.
The loss of automotive powering sales is never going to be replaced by us buying our few litres for our caravans and motorhomes. Many of these users also covering their higher energy needs from site EHUs.
Its continuing availability for our leisure use will largely depend on non forecourt outlets, piggy backing on larger users, like agricultural, grain drying and the like. Even the often sited venders to Taxis as a source, is doomed as these vehicles powered by LPG overtime become banned or hit by increasing pollution surcharges.