.online, .top, .xyz. info and .shop are some of the top TLDs that scammers use, precisely because of their rock bottom registrar fees that make them attractive for sites that have a shelf life of a few hours or a few days before being blocked. As a result, many places have a blanket "suspicious" flag for fresh domains under these TLDs.
If you plan on building a legit site, do not use any of these cheap TLDs.
Paying through the nose for a .com that is remotely memorable and easy to spell is not a great path forward for a hobbyist or someone who simply wants their own domain for email.
I know someone with a .org domain, and even they have a ton of issues with false flags on their emails due to not coming from a big email provider. They’ve been blacklisted a couple times and regularly get flagged as spam. I’m surprised he hasn’t given up after dealing with this stuff for 25 years.
These new TLDs, I thought, were supposed to open up more options for regular people to get a domain that is semi-decent. Instead they’re essentially useless. Some of the prices are also still insane, due to assumed “premium” status or domain squatters.
There has to be a better way to police this stuff.