Gmail+Outlook vs Alternative SMTP Servers for Cold B2B

I've noticed a mainstream shift from third-party SMTP providers to exclusively mixed Gmail & Outlook.
Is deliverability really better? Or is Emailchaser just spreading a false notion?
Nonetheless, it's a lot more simple to deal with.

What's your experience with Gmail+Outlook vs your own solutions?

You can start with gmail, it may have good inbox rate, but some times your accs will be blocked so fast
if you send too much spam, i believe it's should be very risky to send more than 100 mails daily from a single gmail accs
Then if you plan to running 1k accs, you need more proxy

With private domain smtp, you have to keep warmup otherwise your domain/ip will be blocked fast too

So I guees there is no easy way, you may start with gmail/outlook then try both

You can use third-party providers like SendGrid, SMTPmart and Amazon SES for better deliverability and advanced features for high-volume or transactional emails.

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• Gmail/Outlook – Low limits, high risk, not for cold emails
• SMTPwire / WarmupSMTP / DedicatedSMTPServer –
  High volume
  Cold email–friendly
  Safe with warmed IPs

Verdict: Use SMTPwire setup for safe & scalable cold outreach.

Gmail has worked the best for me. But you MUST thoroughly warm and send very gently.