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Yes they are very reliable affiliate program. They have good CS. They are the only ones except bet365 who did not steal from affiliates (some people disagree here about bet365, but I insist on that).
You have to ask yourself whether you do not need US, UK, ES, IT, CZ, NL traffic, because 1xbet does not operate everywhere. In many other countries you will get signups but no players, because local brands are way stronger.
Problem nr. 1 is that they steal from players.
Problem nr. 2 is their projected longevity. They are not in love by local governments, everything goes towards regulation, and they do not have the licence. I can see future where their websites will be just banned like in CZ and/or where they voluntarily withdraw. Or I can see future where common players will fins a way how to bet abroad even through the censorship. But even if the later happens, I doubt people will choose 1xbet because of their horrible reputation amongst players.
That said I like them. In Europe they are the only ones producing growing affiliate revenue. But in most EU areas they are worth of zero. Their only really string country in EU is Portugal (80% of my 1xbet revenue is from there). And they are so strong there that I am afraid something bad will happen there.
We are all bloodsucking ticks, hungry, devious
each one latched on to the ass of the previous
when the last and the first latch on it can be shown
ass-blood sucked by the first from the last is his own