>for years now
Seriously?
I open a thread each month for the monthly movie night, so I have a regular "sample". In my experience there was a period couple of years ago when they had captcha on continuously. There was a footy cup on too, and I remember it sucked to post. Since then nothing.
>I think they just geofucked israel
That's a possibility. I don't know the underlying codebase. I think they changed a lot since the last lynxchan update.
>Brave on mobile
You can test this. Try to post from desktop and with different browsers both on phone and desktop.
Actually you can test the geolocation theory with a free VPN if you have protonmail. Actually some proxy services offer a couple of free proxies just for a signup. (These are better than the free proxies one can find on various sites.)