Users may find it immoral to use adblockers as small sites may lose revenue, and further it may lead to non-free services.

However, adblockers may be disabled per site if desired.

Benefits of adblockers include

It is lawful in most if not all countries to use adblockers as the user has the right to control the content they forsee.

Chrome Extension Ublock Origin Lite Chromium has "upgraded" to manifest V3 combatting adblockers and so only the lite version is available. Firefox, however, has the regular version.

Firefox Extension Ublock Origin