.eu isn’t the most legitimate looking domain. They probably just have some rules around which domains tend to be spam/scam/bs
.eu domains are not uncommon over here.
neither are commonly used, but neither are spam domains
adamj.eu alsd.eu alternatives.eu belleslettres.eu bergfreunde.eu berthub.eu bitsnbites.eu bizin.eu btcdirect.eu carlschwan.eu ceridap.eu coolblue.eu cpcwiki.eu cubilis.eu datadoghq.eu doshaven.eu epicompany.eu eui.eu eupl.eu euplf.eu eurescrossborder.eu europa.eu forum.eu framelabs.eu gdprhub.eu geizhals.eu gmic.eu hownormalami.eu ibabs.eu inflation.eu itgovernance.eu johnmathews.eu juliareda.eu list.eu maxlath.eu noyb.eu politico.eu postgresql.eu publiccode.eu qonto.eu sagefund.eu secondwheels.eu sifted.eu skikk.eu successfactors.eu surnamemap.eu tjinstoko.eu xahteiwi.eu z80cpu.eu
Some of these are fairly small/obscure; some are fairly significant: europe.eu is the site for a lot of what the EU does; politico.eu is a well known media organisation; coolblue.eu is major Dutch retail business, etc.